1+2=3 - 2+1=3, 3+2=5 - 2+3=5, 4+5=9 - 5+4=9, 9+8=17 - 8+9=17, 3+4=7 - 4+3=7, 6+5=11 - 5+6=11,

Commutative - Matching Pairs

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