17-16=

12-3=

18-2=

18-1=

13-9=

18-8=

14-3=

16-12=

18-7=

19-0=

12-8=

17-9=

19-2=

11-10=

17-7=

20-4=

20-11=

16-15=

19-10=

13-13=

13-6=

13-5=

20-1=

18-10=

19-1=

17-15=

13-10=

15-2=

20-0=

14-3=

13-1=

18-4=

13-8=

20-11=

17-3=

18-5=

14-0=

11-1=

12-9=

16-7=

20-16=

11-10=

12-1=

16-8=

11-4=

18-9=

13-4=

17-3=

12-9=

19-19=