2+3= 4-1= 0+2= 2+5=
9-4= 8-5= 6+3= 4+5=
3-3= 6-0= 9-7= 8-7=
3+3= 5-1= 1+( )= 6 4+( )=8
8+1= 9-8= ( )-( )=0 ( )+( )=8
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