True: 1+1=2, 1+3=4, 8+2=10, 9-3=6, 10-5=5, 5+1=6, 20-10=10, 50-10=40, 25-15=10, 18-9=9, 25+5=30, 26-12=14, 8+15=23, 9+19=28, 29-14=15, 23-14=9, 8+9=17, 20-10=10, 50-21=29, 40-20=20, 4+15=19, 2+9=11, 19-7=12, 31-30=1, 16-9=7, 13+21=33, 19-2=17, 45-25=20, 16+18=34, 17+15=32, False: 1+8=7, 15+3=20, 20-10=20, 15-10=10, 5+1=10, 9-6=5, 7-2=4, 5+8=16, 8+9=25, 30-15=20, 1+1=3, 2+4=8, 8+6=17, 8+1=12, 6+7=15, 3+4=8, 9-1=5, 6+12=20, 3+14=15, 3+1=2, 6+8=14, 9-7=4, 40+10=45, 30-20=15, 19-8=12, 25+12=47, 26+12=28, 36-13=26, 17+15=35, 19-5=16,

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