Forgot the 13?

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(Can you add mine? I know I'm new)7th and 8th
2nd and 10th
6th and 9th
3rd and 4th(W)
12th and 12th
4th (M) and 5th and 11th
(These are the groups they are stuck in until they find each other if I left your carrie out please tell me I will explain this later)
(Can you add mine? I know I'm new)