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1+()=20 (a)
18+( )=20 (a)
3+17= (a)
16+( )=20 (a)
15+( )=18 (a)
6+5= (a)
7+( )=20 (a)
8+11= (a)
10+( )=15 (a)
4+( )=16 (a)
11+6= (a)
4+( )=14 (a)
14+( )=19 (a)
2=( )=11 (a)
11+( )=17 (a)
6+8= (a)
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