Correct: 1+2=3, 2+3=4, 3+4=7, 4+5=9, 5+6=11, 6+7=13, 7+8-=15, 8+9=17, 9+10=19, Incorrect: 5+6=13, 7+8=20, 6+7=19, 3+4=9, 4+5=11,

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