Corretto: 10-8=2, 10+10=20, 19+1=20, 18+2=20, 11+8=19, 12+5=17, 13+7=10, 18+1=19, 15+5=20, 1+5=6, 15+2=17, 0+0=0, 7+2=9, 9+0=9, 20+0=20, Errato: 5+1=0, 8+5=5, 10+2=8, 6+2=6, 2+3=7, 2+10=7, 8+2=9, 10+0=0, 1+0=0, 6+4=8, 20+6=6, 8+1=10, 7+2=15, 9+0=0, 7+1=9,

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