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+# zero
+
+```
+xor eax, eax
+```
+
+# one
+```
+xor eax, eax
+inc eax
+```
+
+# next
+```
+inc ax
+```
+
+# prev
+```
+dec ax
+```
+
+# sum
+```
+mov dx, ax
+add dx, bx
+```
+
+# sub
+```
+mov rdx, rax
+sub rdx, rbx
+```
+
+# imul
+```
+imul bl
+mov dx, ax
+```
+
+# idiv
+```
+cwd
+idiv bx
+mov dx, ax 
+```