20+10=30
41+9=50
3+3=
3+3=6
4+8=
4+8=12
2x7=
2x7=14
6x4=
6x4=24
5x7=
5x7=35
4x2x1=
4x2x1=8
5x3x1
5x3x1=15
6x2x1
6x2x1=12
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