17 - 12+5=, 18 - 14+4=, 16 - 9+7=, 19 - 17+2=, 20 - 16+4=, 12 - 11+1=, 13 - 9+4=, 14 - 7+7=, 10 - 2+5+3=, 11 - 3+4+3=,

EL1 Add numbers up to 20

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