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    List comprehension is a nested loop . we can create this in two ways

    the first way

    a = int(input()) b = int(input()) c = int(input()) n = int(input()) listt = [] for i in range(a+1): for j in range(b+1): for k in range(c+1): if i+j+k != n: listt.append([i,j,k])
    print(listt)

    the second way

    a = int(input()) b = int(input()) c = int(input()) n = int(input()) listt = [[i,j,k] for i in range(a+1)for j in range(b+1)for k in range(c+1)if (i+j+k) !=n]
    print(listt)