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>.386
.model flat, stdcall
option casemap:none
include \masm32\include\windows.inc
include \masm32\include\user32.inc
includelib \masm32\lib\user32.lib
.data
M db "this will be filled with xs",0
.code
memset proc source:dword, dest:dword, ln:dword
pushad
mov edi,dest
mov...