1 + 1 =, 1 + 2 =, 2 + 2 =, 2 + 3 =, 3 + 3 =, 3 + 4 =, 4 + 4 =, 4 + 5 =, 5 + 5 =, 5 + 6=, 6 + 6=, 6 + 7=, 7 + 7=, 7 + 8=, 8 + 8=, 8 + 9=, 9 + 9=, 9 + 10=, 10 + 10=, 10 + 11=.

Doubles and Doubles Plus

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