Correct: 8-4=4, 2+7=9, 11-3=8, 10-3=7, 9+2=11, 4-4=0, 7+0=7, 4-1=3, 6+7=13, 0+1=1, 2+3=5, 1+4=5, 10-8=2, 4-3=1, 9+8=17, 5+9=14, 3+0=3, 5-5=0, 5+1=6, 9-4=5, 13-8=5, 8+4=12, 6+5=11, 9+9=18, Incorrect: 11-8=4, 9+8=18, 6+7=3, 3+0=0, 5-5=1, 6+5=1, 9+4=14, 5+1=2, 5+9=4, 4-3=2, 10+8=16, 10-3=5, 8+8=17,

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