19-5= 10+7= 9+6= 13-0= 14-7=
12-7= 15-6= 8+4= 11-9= 14-5=
16-9 6 11-4 7
12-4 13-5 13-7 13-6
15-7 14-8 16-8 17-8
9+ =13 18- =9
11-5=12- 9+6=8+
11-9=10- 9+8=7+
(只)