Correct: 50+30=80, 20+30=50, 10+50=60, 60+20=80, 30+30=60, 70+20=90, 50+40=90, 20+40=60, 60+10=70, 40+30=70, Incorrect: 50+30=70, 40+20=70, 90+10=80, 70+20=50, 30+20=40,

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