for k, f in enumerate([10, 8, 5, 3]):
    print("f:=====",f)
    for i, j in product(range(f), repeat=2):
        print(i,j)

f:===== 3
0 0
0 1
0 2
1 0
1 1
1 2
2 0
2 1
2 2
f:===== 5
0 0
0 1
0 2
0 3
0 4
1 0
1 1
1 2
1 3
1 4
2 0
2 1
2 2
2 3
2 4
3 0
3 1
3 2
3 3
3 4
4 0
4 1
4 2
4 3
4 4
 

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