Subtraction

Front 1

5-2

Back 1

3

Front 2

3-1

Back 2

2

Front 3

4-3

Back 3

1

Front 4

4-1

Back 4

3

Front 5

5-4

Back 5

1

Front 6

6-1

Back 6

5

Front 7

6-2

Back 7

4

Front 8

7-5

Back 8

2

Front 9

6-3

Back 9

3

Front 10

6-4

Back 10

2

Front 11

7-3

Back 11

4

Front 12

6-5

Back 12

1

Front 13

7-1

Back 13

6

Front 14

7-2

Back 14

5

Front 15

7-4

Back 15

3

Front 16

7-6

Back 16

1

Front 17

4-2

Back 17

2

Front 18

5-1

Back 18

4

Front 19

5-3`

Back 19

2

Front 20

2-1

Back 20

1

Front 21

3-2

Back 21

1