6-4= 19-2= 7+2=
13-1= 10-9= 8+2=
19-16= 7-2= 15-13=
15-2= 9+2= 10-1=
2-2= 10+2= 14-10=
11+2= 7+8= 16+2=
2+7= 16-16= 6+8=
1+3= 1+9= 10+8=
14-13= 2+3= 3+3=
10+1= 13-11= 4+3=
13-1= 10-9= 8+2=
19-16= 7-2= 15-13=
15-2= 9+2= 10-1=
2-2= 10+2= 14-10=
11+2= 7+8= 16+2=
2+7= 16-16= 6+8=
1+3= 1+9= 10+8=
14-13= 2+3= 3+3=
10+1= 13-11= 4+3=

