0+1, 1+1, 2+1, 1+3, 3+2, 3+3, 5+2, 4+4, 6+3, 6+4, 5+6, 8+4, 5+8, 9+5, 4+11, 12+4, 7+10, 9+9, 6+13, 17+3

adding up to 20

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