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

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