When inputting /testfor @a[m=1,m=2], only the last one is used.

Error caused by (what I think is) not having both game modes at once.

Possible fix: /testfor @a[m=1,m=2] -works with both characters
Possible fix: /testfor @a[m=1;2] -alow one arguement to have multiple inputs, such as having multiple score_* arguements