6+12= 5-15= 18-12= 1-19=
0+17= 15+4= 19+1= 1+3=
16+13= 15+5= 8+6= 14-2=
10+11= 8+8= 9-5= 5+6=
5-18= 0-14= 4+16= 5-10=
1-18= 3+18= 14-19= 4-0=
11+17= 15-2= 7-9= 19+4=
16+10= 3-16= 14+19= 16+18=
10+0= 2+18= 16+1= 4+1=
1+8= 10-0= 4-0= 8-1=