Spreadsheet formula/function/process

I need to automate this process.

I create pairs of data ie

A v F, F v D, B v E, C v A, A v B, E v C, D v E, B v F, C v D, F v E, A v D, 
D v B, B v C, C v F, E v A

I'd like them sorted so that each piece of data appears once in a group but still in their pairs eg.
Group 1
A v F
B v E
C v D
Group  ... Show more