18-9= 17-9= 16-9= 15-9= 11-4=
14-9= 13-9= 12-9= 11-9= 12-3=
17-8= 16-8= 15-8= 14-8= 11-3=
13-8= 12-8= 11-8= 16-7= 11-2=
15-7= 14-7= 13-7= 12-7= 11-5=
11-7= 15-6= 14-6= 13-6= 12-4=
12-6= 11-6= 14-5= 13-5= 13-4=
18-9= 17-9= 16-9= 15-9= 11-4=
14-9= 13-9= 12-9= 11-9= 12-3=
17-8= 16-8= 15-8= 14-8= 11-3=
13-8= 12-8= 11-8= 16-7= 11-2=
15-7= 14-7= 13-7= 12-7= 11-5=
11-7= 15-6= 14-6= 13-6= 12-4=
12-6= 11-6= 14-5= 13-5= 13-4=