11-(     )=4

11-(     )=0

11-(     )=0

16-(     )=0

11-(     )=3

15-(     )=1

20-(     )=18

19-(     )=0

16-(     )=9

13-(     )=12

20-(     )=17

13-(     )=2

20-(     )=16

16-(     )=0

19-(     )=15

12-(     )=2

20-(     )=4

18-(     )=3

20-(     )=8

19-(     )=10

12-(     )=9

17-(     )=4

11-(     )=3

18-(     )=1

11-(     )=4

16-(     )=16

12-(     )=8

15-(     )=14

17-(     )=10

13-(     )=5

16-(     )=3

13-(     )=9

18-(     )=14

16-(     )=1

14-(     )=10

20-(     )=0

15-(     )=6

16-(     )=3

14-(     )=6

14-(     )=12

17-(     )=11

12-(     )=2

13-(     )=7

12-(     )=1

18-(     )=4

13-(     )=13

19-(     )=16

17-(     )=0

17-(     )=5

17-(     )=0