19-18=

12-4=

13-10=

13-2=

14-8=

14-5=

16-8=

19-16=

18-13=

12-12=

17-8=

17-2=

11-8=

11-2=

15-8=

16-2=

15-8=

11-9=

11-1=

12-8=

13-13=

12-12=

16-3=

19-18=

15-12=

19-15=

14-10=

18-10=

18-12=

17-16=

16-2=

12-6=

19-19=

13-8=

20-18=

12-1=

13-5=

18-11=

12-2=

15-15=

19-11=

18-0=

14-7=

20-7=

12-4=

11-9=

15-15=

14-12=

11-7=

20-0=