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