diff --git a/seminar09_libraries/01_balls/balls.cpp b/seminar09_libraries/01_balls/balls.cpp
new file mode 100644
index 0000000..17eb832
--- /dev/null
+++ b/seminar09_libraries/01_balls/balls.cpp
@@ -0,0 +1,94 @@
+#include <SFML/Graphics.hpp>
+#include <iostream>
+#include <vector>
+#include <cstdlib>
+#include <ctime>
+
+using namespace std;
+
+
+struct Ball
+{
+    float radius;
+    sf::Vector2f position;
+    sf::Vector2f velocity;
+};
+
+
+int main()
+{
+    srand(time(0));
+    
+    const int width = 1000;
+    const int height = 800;
+    const int n_balls = 100;
+
+    // Шаг по времени
+    const float delta_t = 0.1;
+
+    // Создаём экземпляр класса окно
+    sf::RenderWindow window(sf::VideoMode(width, height), "My window");
+    // Задаём максимальное количество кадров в секунду
+    window.setFramerateLimit(60);
+
+    // Так как sf::CircleShape занимает много памяти, создаём всего 1 экземпляр
+    sf::CircleShape circle(50.0f);
+    circle.setFillColor({200, 216, 200});
+
+    std::vector<Ball> balls;
+    balls.resize(n_balls);
+    for (int i = 0; i < n_balls; i++)
+    {
+        balls[i].radius = 4 + rand() % 8;
+        balls[i].position = {(float)(rand() % width), (float)(rand() % height)};
+        balls[i].velocity = {(float)(rand() % 100 - 50), (float)(rand() % 100 - 50)};
+    }
+
+    while (window.isOpen())
+    {
+        sf::Event event;
+        while (window.pollEvent(event))
+        {
+            // В данном примере проверяем окно на закрытие
+            if (event.type == sf::Event::Closed)
+                window.close();
+        }
+
+        // очистить скрытый холст черным цветом
+        window.clear(sf::Color::Black);
+
+        for (int i = 0; i < n_balls; i++)
+        {
+            balls[i].position += balls[i].velocity * delta_t;
+
+            /*
+            if (balls[i].position.x < 0)
+                balls[i].position.x += width;
+            if (balls[i].position.x > width)
+                balls[i].position.x -= width;
+
+            if (balls[i].position.y < 0)
+                balls[i].position.y += height;
+            if (balls[i].position.y > height)
+                balls[i].position.y -= height;
+            */
+
+            // Используем 1 sf::CircleShape, чтобы нарисовать все шары
+            circle.setRadius(balls[i].radius);
+            // setOrigin - задаёт центр объекта
+            // По умолчанию центр - в левом верхнем угле объекта
+            // Строка ниже устанавливает центр в центре шарика
+            // В дальнейшем функция, setPosition устанавливает положение шарика так, 
+            // чтобы его центр был в точке balls[i].position
+            circle.setOrigin(balls[i].radius, balls[i].radius);
+            circle.setPosition(balls[i].position);
+            
+            window.draw(circle);
+        }
+
+        // отображаем содержимое скрытого холста на экран
+        window.display();
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/seminar09_libraries/02_thor/Makefile b/seminar09_libraries/02_thor/Makefile
new file mode 100644
index 0000000..8fd709a
--- /dev/null
+++ b/seminar09_libraries/02_thor/Makefile
@@ -0,0 +1,2 @@
+balls:
+	g++ ./balls.cpp -std=c++11 -o balls.exe -I../../../3rdparty/SFML-2.5.1/include -L ../../../3rdparty/SFML-2.5.1/lib/ -lsfml-graphics -lsfml-window -lsfml-system 
diff --git a/seminar09_libraries/02_thor/balls.cpp b/seminar09_libraries/02_thor/balls.cpp
new file mode 100644
index 0000000..3ce2b4e
--- /dev/null
+++ b/seminar09_libraries/02_thor/balls.cpp
@@ -0,0 +1,93 @@
+#include <SFML/Graphics.hpp>
+#include <iostream>
+#include <vector>
+#include <cstdlib>
+#include <ctime>
+
+using namespace std;
+
+
+struct Ball
+{
+    float radius;
+    sf::Vector2f position;
+    sf::Vector2f velocity;
+};
+
+
+int main()
+{
+    srand(time(0));
+    
+    const int width = 1000;
+    const int height = 800;
+    const int n_balls = 100;
+    // Шаг по времени
+    const float delta_t = 0.1;
+
+    // Создаём экземпляр класса окно
+    sf::RenderWindow window(sf::VideoMode(width, height), "My window");
+    // Задаём максимальное количество кадров в секунду
+    window.setFramerateLimit(60);
+
+    // Так как sf::CircleShape занимает много памяти, создаём всего 1 экземпляр
+    sf::CircleShape circle(50.0f);
+    circle.setFillColor({200, 216, 200});
+
+    std::vector<Ball> balls;
+    balls.resize(n_balls);
+    for (int i = 0; i < n_balls; i++)
+    {
+        balls[i].radius = 4 + rand() % 8;
+        balls[i].position = {(float)(rand() % width), (float)(rand() % height)};
+        balls[i].velocity = {(float)(rand() % 100 - 50), (float)(rand() % 100 - 50)};
+    }
+
+    while (window.isOpen())
+    {
+        sf::Event event;
+        while (window.pollEvent(event))
+        {
+            // В данном примере проверяем окно на закрытие
+            if (event.type == sf::Event::Closed)
+                window.close();
+        }
+
+        // очистить скрытый холст черным цветом
+        window.clear(sf::Color::Black);
+
+        for (int i = 0; i < n_balls; i++)
+        {
+            balls[i].position += balls[i].velocity * delta_t;
+
+            
+            if (balls[i].position.x < 0)
+                balls[i].position.x += width;
+            if (balls[i].position.x > width)
+                balls[i].position.x -= width;
+
+            if (balls[i].position.y < 0)
+                balls[i].position.y += height;
+            if (balls[i].position.y > height)
+                balls[i].position.y -= height;
+            
+
+            // Используем 1 sf::CircleShape, чтобы нарисовать все шары
+            circle.setRadius(balls[i].radius);
+            // setOrigin - задаёт центр объекта
+            // По умолчанию центр - в левом верхнем угле объекта
+            // Строка ниже устанавливает центр в центре шарика
+            // В дальнейшем функция, setPosition устанавливает положение шарика так, 
+            // чтобы его центр был в точке balls[i].position
+            circle.setOrigin(balls[i].radius, balls[i].radius);
+            circle.setPosition(balls[i].position);
+            
+            window.draw(circle);
+        }
+
+        // отображаем содержимое скрытого холста на экран
+        window.display();
+    }
+
+    return 0;
+}
diff --git a/seminar09_libraries/03_walls/balls.cpp b/seminar09_libraries/03_walls/balls.cpp
new file mode 100644
index 0000000..ac923e9
--- /dev/null
+++ b/seminar09_libraries/03_walls/balls.cpp
@@ -0,0 +1,90 @@
+#include <SFML/Graphics.hpp>
+#include <iostream>
+#include <vector>
+#include <cstdlib>
+#include <ctime>
+
+using namespace std;
+
+
+struct Ball
+{
+    float radius;
+    sf::Vector2f position;
+    sf::Vector2f velocity;
+};
+
+
+int main()
+{
+    srand(time(0));
+    
+    const int width = 1000;
+    const int height = 800;
+    const int n_balls = 100;
+
+    // Шаг по времени
+    const float delta_t = 0.1; ///
+
+    // Создаём экземпляр класса окно
+    sf::RenderWindow window(sf::VideoMode(width, height), "My window");
+    // Задаём максимальное количество кадров в секунду
+    window.setFramerateLimit(60);
+
+    // Так как sf::CircleShape занимает много памяти, создаём всего 1 экземпляр
+    sf::CircleShape circle(50.0f);
+    circle.setFillColor({200, 216, 200});
+
+    std::vector<Ball> balls;
+    balls.resize(n_balls);
+    for (int i = 0; i < n_balls; i++)
+    {
+        balls[i].radius = 4 + rand() % 8;
+        balls[i].position = {(float)(rand() % width), (float)(rand() % height)};
+        balls[i].velocity = {(float)(rand() % 100 - 50), (float)(rand() % 100 - 50)};
+    }
+
+    while (window.isOpen())
+    {
+        sf::Event event;
+        while (window.pollEvent(event))
+        {
+            // В данном примере проверяем окно на закрытие
+            if (event.type == sf::Event::Closed)
+                window.close();
+        }
+
+        // очистить скрытый холст черным цветом
+        window.clear(sf::Color::Black);
+
+        for (int i = 0; i < n_balls; i++)
+        {
+            balls[i].position += balls[i].velocity * delta_t;
+
+            
+            if ((balls[i].position.x < 0) || (balls[i].position.x > width))
+                balls[i].velocity.x = -balls[i].velocity.x;
+
+            if ((balls[i].position.y < 0) || (balls[i].position.y > height))
+                balls[i].velocity.y = -balls[i].velocity.y;
+            
+
+            // Используем 1 sf::CircleShape, чтобы нарисовать все шары
+            circle.setRadius(balls[i].radius);
+            // setOrigin - задаёт центр объекта
+            // По умолчанию центр - в левом верхнем угле объекта
+            // Строка ниже устанавливает центр в центре шарика
+            // В дальнейшем функция, setPosition устанавливает положение шарика так, 
+            // чтобы его центр был в точке balls[i].position
+            circle.setOrigin(balls[i].radius, balls[i].radius);
+            circle.setPosition(balls[i].position);
+            
+            window.draw(circle);
+        }
+
+        // отображаем содержимое скрытого холста на экран
+        window.display();
+    }
+
+    return 0;
+}
diff --git a/seminar09_libraries/04_n_bodies/balls.cpp b/seminar09_libraries/04_n_bodies/balls.cpp
new file mode 100644
index 0000000..0ec3f0f
--- /dev/null
+++ b/seminar09_libraries/04_n_bodies/balls.cpp
@@ -0,0 +1,89 @@
+#include <SFML/Graphics.hpp>
+#include <iostream>
+#include <vector>
+#include <cstdlib>
+#include <ctime>
+#include <cmath>
+
+using namespace std;
+
+const int min_distance = 5;
+const float G = 500;
+
+struct Ball
+{
+    float radius;
+    float mass = 1;
+    sf::Vector2f position;
+    sf::Vector2f velocity;
+};
+
+
+int main()
+{
+    srand(time(0));
+    
+    const int width = 1000;
+    const int height = 800;
+    const int n_balls = 15;
+
+    // Шаг по времени
+    const float delta_t = 0.1;
+    sf::RenderWindow window(sf::VideoMode(width, height), "My window");
+    window.setFramerateLimit(60);
+    sf::CircleShape circle(50.0f);
+    circle.setFillColor({200, 216, 200});
+    std::vector<Ball> balls;
+    balls.resize(n_balls);
+    for (int i = 0; i < n_balls; i++)
+    {
+        balls[i].radius = 4 + rand() % 8;
+        balls[i].position = {(float)(rand() % width), (float)(rand() % height)};
+        balls[i].velocity = {(float)(rand() % 100 - 50), (float)(rand() % 100 - 50)};
+    }
+    while (window.isOpen())
+    {
+        sf::Event event;
+        while (window.pollEvent(event))
+        {
+            if (event.type == sf::Event::Closed)
+                window.close();
+        }
+
+        window.clear(sf::Color::Black);
+
+        for (int i = 0; i < n_balls; i++)
+        {
+            
+            balls[i].position += balls[i].velocity * delta_t;
+            for (int j = 0; j < n_balls; ++j) {
+                if (i == j)
+                        continue;
+                float distance = std::sqrt((balls[j].position.x - balls[i].position.x) * (balls[j].position.x - balls[i].position.x) + (balls[j].position.y - balls[i].position.y) * (balls[j].position.y - balls[i].position.y)); 
+                if (distance < min_distance)
+                        continue;
+                auto direction = balls[j].position - balls[i].position;
+                balls[i].velocity += (direction * G * delta_t * balls[j].mass) / (distance * distance);
+                }
+            
+            if (((balls[i].position.x - balls[i].radius) < 0) || (balls[i].position.x + balls[i].radius> width)) {
+                balls[i].velocity.x = -balls[i].velocity.x;
+                balls[i].position.x = (balls[i].position.x - balls[i].radius < 0 ? balls[i].radius : width - balls[i].radius);
+            }
+            if ((balls[i].position.y - balls[i].radius < 0) || (balls[i].position.y + balls[i].radius > height)) {
+                balls[i].velocity.y = -balls[i].velocity.y;
+                balls[i].position.y = (balls[i].position.y - balls[i].radius < 0 ? balls[i].radius : height - balls[i].radius);
+            }
+
+            circle.setRadius(balls[i].radius);
+            circle.setOrigin(balls[i].radius, balls[i].radius);
+            circle.setPosition(balls[i].position);
+            
+            window.draw(circle);
+        }
+
+        window.display();
+    }
+
+    return 0;
+}
diff --git a/seminar09_libraries/05_n_bodies_mass/balls.cpp b/seminar09_libraries/05_n_bodies_mass/balls.cpp
new file mode 100644
index 0000000..daab660
--- /dev/null
+++ b/seminar09_libraries/05_n_bodies_mass/balls.cpp
@@ -0,0 +1,95 @@
+#include <SFML/Graphics.hpp>
+#include <iostream>
+#include <vector>
+#include <cstdlib>
+#include <ctime>
+#include <cmath>
+
+using namespace std;
+
+const int min_distance = 5;
+const float G = 500;
+
+struct Ball
+{
+    float radius;
+    float mass;
+    sf::Vector2f position;
+    sf::Vector2f velocity;
+};
+
+
+int main()
+{
+    srand(time(0));
+    
+    const int width = 1000;
+    const int height = 800;
+    const int n_balls = 15;
+
+    // Шаг по времени
+    const float delta_t = 0.1;
+    sf::RenderWindow window(sf::VideoMode(width, height), "My window");
+    window.setFramerateLimit(60);
+    sf::CircleShape circle(50.0f);
+    circle.setFillColor({200, 216, 200});
+    std::vector<Ball> balls;
+    balls.resize(n_balls);
+    for (int i = 0; i < n_balls; i++)
+    {
+        balls[i].radius = 4 + rand() % 8;
+        balls[i].mass = balls[i].radius * balls[i].radius / 100;
+        balls[i].position = {(float)(rand() % width), (float)(rand() % height)};
+        balls[i].velocity = {(float)(rand() % 100 - 50), (float)(rand() % 100 - 50)};
+    }
+/*    balls[0].radius = 15;
+    balls[0].mass = 1000;
+    balls[0].position = {(float)(rand() % width), (float)(rand() % height)};
+    balls[0].velocity = {(float)(rand() % 100 - 50), (float)(rand() % 100 - 50)};
+    */
+    while (window.isOpen())
+    {
+        sf::Event event;
+        while (window.pollEvent(event))
+        {
+            if (event.type == sf::Event::Closed)
+                window.close();
+        }
+
+        window.clear(sf::Color::Black);
+
+        for (int i = 0; i < n_balls; i++)
+        {
+            
+            balls[i].position += balls[i].velocity * delta_t;
+            for (int j = 0; j < n_balls; ++j) {
+                if (i == j)
+                        continue;
+                float distance = std::sqrt((balls[j].position.x - balls[i].position.x) * (balls[j].position.x - balls[i].position.x) + (balls[j].position.y - balls[i].position.y) * (balls[j].position.y - balls[i].position.y)); 
+                if (distance < min_distance)
+                        continue;
+                auto direction = balls[j].position - balls[i].position;
+                balls[i].velocity += (direction * G * delta_t * balls[j].mass) / (distance * distance);
+                }
+            
+            if (((balls[i].position.x - balls[i].radius) < 0) || (balls[i].position.x + balls[i].radius> width)) {
+                balls[i].velocity.x = -balls[i].velocity.x;
+                balls[i].position.x = (balls[i].position.x - balls[i].radius < 0 ? balls[i].radius : width - balls[i].radius);
+            }
+            if ((balls[i].position.y - balls[i].radius < 0) || (balls[i].position.y + balls[i].radius > height)) {
+                balls[i].velocity.y = -balls[i].velocity.y;
+                balls[i].position.y = (balls[i].position.y - balls[i].radius < 0 ? balls[i].radius : height - balls[i].radius);
+            }
+
+            circle.setRadius(balls[i].radius);
+            circle.setOrigin(balls[i].radius, balls[i].radius);
+            circle.setPosition(balls[i].position);
+            
+            window.draw(circle);
+        }
+
+        window.display();
+    }
+
+    return 0;
+}
diff --git a/seminar09_libraries/06_n_bodies_charges/balls.cpp b/seminar09_libraries/06_n_bodies_charges/balls.cpp
new file mode 100644
index 0000000..d4b38ac
--- /dev/null
+++ b/seminar09_libraries/06_n_bodies_charges/balls.cpp
@@ -0,0 +1,99 @@
+#include <SFML/Graphics.hpp>
+#include <iostream>
+#include <vector>
+#include <cstdlib>
+#include <ctime>
+#include <cmath>
+
+using namespace std;
+
+const int min_distance = 5;
+const float K = 25;
+
+struct Ball
+{
+    float radius;
+    float charge;
+    sf::Vector2f position;
+    sf::Vector2f velocity;
+};
+
+
+int main()
+{
+    srand(time(0));
+    
+    const int width = 1000;
+    const int height = 800;
+    int n_balls = 4;
+
+    const float delta_t = 0.1;
+    sf::RenderWindow window(sf::VideoMode(width, height), "My window");
+    window.setFramerateLimit(60);
+    sf::CircleShape circle(50.0f);
+
+    std::vector<Ball> balls;
+    balls.resize(n_balls);
+    for (int i = 0; i < n_balls; i++)
+    {
+        balls[i].radius = 4 + rand() % 8;
+        balls[i].charge = (rand() % 8 - rand() % 8) * balls[i].radius * balls[i].radius;
+        while (!balls[i].charge) {
+            balls[i].charge = (rand() % 8 - rand() % 8) * balls[i].radius * balls[i].radius;
+        }
+        balls[i].position = {(float)(rand() % width), (float)(rand() % height)};
+        balls[i].velocity = {(float)(rand() % 100 - 50), (float)(rand() % 100 - 50)};
+    }
+    while (window.isOpen())
+    {
+        sf::Event event;
+        while (window.pollEvent(event))
+        {
+            if (event.type == sf::Event::Closed)
+                window.close();
+        }
+
+        window.clear(sf::Color::Black);
+
+        for (int i = 0; i < n_balls; i++)
+        {
+            
+            balls[i].position += balls[i].velocity * delta_t;
+            for (int j = 0; j < n_balls; ++j) {
+                if (i == j)
+                        continue;
+                float distance = std::sqrt((balls[j].position.x - balls[i].position.x) * (balls[j].position.x - balls[i].position.x) + (balls[j].position.y - balls[i].position.y) * (balls[j].position.y - balls[i].position.y)); 
+                if (distance < min_distance)
+                        continue;
+                auto direction = balls[j].position - balls[i].position;
+                if (balls[i].charge * balls[j].charge > 0)
+                        balls[i].velocity -= (direction * K * delta_t * std::abs(balls[j].charge)) / (distance * distance);
+                else
+                        balls[i].velocity += (direction * K * delta_t * std::abs(balls[j].charge)) / (distance * distance);
+                }
+            
+            if (((balls[i].position.x - balls[i].radius) < 0) || (balls[i].position.x + balls[i].radius> width)) {
+                balls[i].velocity.x = -balls[i].velocity.x;
+                balls[i].position.x = (balls[i].position.x - balls[i].radius < 0 ? balls[i].radius : width - balls[i].radius);
+            }
+            if ((balls[i].position.y - balls[i].radius < 0) || (balls[i].position.y + balls[i].radius > height)) {
+                balls[i].velocity.y = -balls[i].velocity.y;
+                balls[i].position.y = (balls[i].position.y - balls[i].radius < 0 ? balls[i].radius : height - balls[i].radius);
+            }
+
+            circle.setRadius(balls[i].radius);
+            circle.setOrigin(balls[i].radius, balls[i].radius);
+            circle.setPosition(balls[i].position);
+            
+            if (balls[i].charge > 0)
+                   circle.setFillColor({static_cast<unsigned char>(balls[i].charge/1152 * 255 + 100), 0, 0}); 
+            else
+                   circle.setFillColor({0, 0, static_cast<unsigned char>(std::abs(balls[i].charge)/1152 * 255 + 100)}); 
+            window.draw(circle);
+        }
+
+        window.display();
+    }
+
+    return 0;
+}
diff --git a/seminar09_libraries/07_n_bodies_charges_mouse/balls.cpp b/seminar09_libraries/07_n_bodies_charges_mouse/balls.cpp
new file mode 100644
index 0000000..5bd8959
--- /dev/null
+++ b/seminar09_libraries/07_n_bodies_charges_mouse/balls.cpp
@@ -0,0 +1,114 @@
+#include <SFML/Graphics.hpp>
+#include <iostream>
+#include <vector>
+#include <cstdlib>
+#include <ctime>
+#include <cmath>
+
+using namespace std;
+
+const int min_distance = 5;
+const float K = 5;
+
+struct Ball
+{
+    float radius;
+    float charge;
+    sf::Vector2f position;
+    sf::Vector2f velocity;
+};
+
+
+int main()
+{
+    srand(time(0));
+    
+    const int width = 1000;
+    const int height = 800;
+    int n_balls = 0;
+
+    char sign = 1;
+
+    // Шаг по времени
+    const float delta_t = 0.1;
+    sf::RenderWindow window(sf::VideoMode(width, height), "My window");
+    window.setFramerateLimit(60);
+    sf::CircleShape circle(50.0f);
+
+    std::vector<Ball> balls;
+    balls.resize(n_balls);
+   while (window.isOpen())
+    {
+        sf::Event event;
+        while (window.pollEvent(event))
+        {
+            if (event.type == sf::Event::Closed)
+                window.close();
+            if (event.type == sf::Event::KeyPressed) {
+                if (event.key.code == sf::Keyboard::LShift) {
+                    sign = -1;
+                }
+            }
+            if (event.type == sf::Event::KeyReleased) {
+                if (event.key.code == sf::Keyboard::LShift) {
+                    sign = 1;
+                }
+            }
+            if(event.type == sf::Event::MouseButtonPressed) {
+                Ball b;
+                if(event.mouseButton.button == sf::Mouse::Right)
+                    b.radius = 15;
+                else if(event.mouseButton.button == sf::Mouse::Left)
+                    b.radius = 5;
+                b.charge = sign * b.radius * b.radius;
+                b.position = {(float)(event.mouseButton.x), (float)(event.mouseButton.y)};
+                b.velocity = {(float)(0), (float)(0)};
+                balls.push_back(b);
+                n_balls++;
+            }
+        }
+
+        window.clear(sf::Color::Black);
+
+        for (int i = 0; i < n_balls; i++)
+        {
+            
+            balls[i].position += balls[i].velocity * delta_t;
+            for (int j = 0; j < n_balls; ++j) {
+                if (i == j)
+                        continue;
+                float distance = std::sqrt((balls[j].position.x - balls[i].position.x) * (balls[j].position.x - balls[i].position.x) + (balls[j].position.y - balls[i].position.y) * (balls[j].position.y - balls[i].position.y)); 
+                if (distance < min_distance)
+                        continue;
+                auto direction = balls[j].position - balls[i].position;
+                if (balls[i].charge * balls[j].charge > 0)
+                        balls[i].velocity -= (direction * K * delta_t * std::abs(balls[j].charge)) / (distance * distance);
+                else
+                        balls[i].velocity += (direction * K * delta_t * std::abs(balls[j].charge)) / (distance * distance);
+                }
+            
+            if (((balls[i].position.x - balls[i].radius) < 0) || (balls[i].position.x + balls[i].radius> width)) {
+                balls[i].velocity.x = -balls[i].velocity.x;
+                balls[i].position.x = (balls[i].position.x - balls[i].radius < 0 ? balls[i].radius : width - balls[i].radius);
+            }
+            if ((balls[i].position.y - balls[i].radius < 0) || (balls[i].position.y + balls[i].radius > height)) {
+                balls[i].velocity.y = -balls[i].velocity.y;
+                balls[i].position.y = (balls[i].position.y - balls[i].radius < 0 ? balls[i].radius : height - balls[i].radius);
+            }
+
+            circle.setRadius(balls[i].radius);
+            circle.setOrigin(balls[i].radius, balls[i].radius);
+            circle.setPosition(balls[i].position);
+            
+            if (balls[i].charge > 0)
+                   circle.setFillColor({200, 0, 0}); 
+            else
+                   circle.setFillColor({0, 0, 200}); 
+            window.draw(circle);
+        }
+
+        window.display();
+    }
+
+    return 0;
+}
diff --git a/seminar09_libraries/homework_libraries.pdf b/seminar09_libraries/homework_libraries.pdf
new file mode 100644
index 0000000..3e86d17
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