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

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