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    Easy solution for the comprehesion list is

    if name == 'main': x = int(input()) y = int(input()) z = int(input()) n = int(input()) result = [] for i in range(0,x+1): for j in range(0,y+1): for k in range(0,z+1): if i+j+k != n: result.append([i,j,k]) print(result)