1.	5 - 1 = 4	15 - 8 = 7	7 - 6 = 1	8 - 7 = 1	7 - 4 = 3
2.	10 - 6 = 4	3 - 1 = 2	13 - 7 = 6	11 - 7 = 4	15 - 6 = 9
3.	4 - 4 = 0	13 - 6 = 7	12 - 6 = 6	5 - 4 = 1	6 - 0 = 6
4.	13 - 7 = 6	15 - 7 = 8	9 - 7 = 2	14 - 7 = 7	12 - 9 = 3
5.	6 - 1 = 5	11 - 2 = 9	8 - 4 = 4	10 - 8 = 2	16 - 7 = 9
6.	12 - 8 = 4	12 - 8 = 4	10 - 7 = 3	13 - 9 = 4	11 - 4 = 7
7.	12 - 4 = 8	17 - 8 = 9	4 - 3 = 1	13 - 6 = 7	14 - 6 = 8
8.	9 - 7 = 2	2 - 1 = 1	15 - 9 = 6	7 - 3 = 4	9 - 6 = 3
9.	7 - 3 = 4	10 - 5 = 5	12 - 9 = 3	13 - 8 = 5	12 - 5 = 7
10.	13 - 8 = 5	9 - 6 = 3	8 - 1 = 7	8 - 6 = 2	12 - 5 = 7
11.	6 - 2 = 4	12 - 3 = 9	8 - 7 = 1	10 - 3 = 7	17 - 9 = 8
12.	14 - 8 = 6	5 - 1 = 4	9 - 4 = 5	11 - 9 = 2	8 - 6 = 2
13.	8 - 8 = 0	12 - 7 = 5	5 - 0 = 5	13 - 4 = 9	14 - 9 = 5
14.	13 - 9 = 4	11 - 9 = 2	16 - 9 = 7	17 - 9 = 8	6 - 5 = 1
15.	14 - 9 = 5	7 - 7 = 0	9 - 5 = 4	14 - 6 = 8	16 - 8 = 8
16.	7 - 5 = 2	9 - 2 = 7	3 - 2 = 1	8 - 2 = 6	6 - 3 = 3
17.	7 - 2 = 5	12 - 3 = 9	1 - 1 = 0	11 - 8 = 3	5 - 3 = 2
18.	4 - 2 = 2	8 - 3 = 5	9 - 3 = 6	11 - 4 = 7	6 - 5 = 1
19.	14 - 8 = 6	6 - 4 = 2	13 - 5 = 8	2 - 1 = 1	11 - 2 = 9
20.	6 - 2 = 4	10 - 1 = 9	14 - 7 = 7	5 - 3 = 2	11 - 6 = 5

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