Correct: 4+4=8, 2+5=7, 9-3=6, 10-5=5, 1+3=4, 3+4=7, 7-5=2, 2+6=8, 6-3=3, 11+2=13, 15+1=16, 17-3=14, 19-5=14, 18+2=20, 13+4=17, 16-4=12, 13-3=10, 17+3=20, 15-2=13, 12+6=18, 17-1=16, 17+1=18, 14+5=19, 18-8=10, 16-2=14, Incorrect: 10-3=8, 11+5=10, 4+3=6, 9-2=5, 8+2=9, 4+3=8, 12-2=11, 6-5=3, 16+2=15, 19-1=17, 13+5=17, 17-3=15, 15-5=12, 18+1=20, 14+4=14, 14-2=13, 16-5=10,

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