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10+40=
50
20+10=
30
20+20=
40
10+10+
20
20+40=
60
30+40=
70
50+30=
80
50+40=
90
70+30=
100
70-60=
10
100-80=
20
90-60=
30
100-60=
40
70-20=
50
90-30=
60
100-30=
70
