Add up to 20

Addition of two numbers with sum up to 20

1

+

6


2

+

9


1

+

3


3

+

2


15

+

1


2

+

17


2

+

3


2

+

13


2

+

4


4

+

8


4

+

2


4

+

4


5

+

9


6

+

6


4

+

13


1

+

2


15

+

2


10

+

7


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