関連ワード:
things that come in pairs of 2 things that come in sets of 2 things that come in groups of 2 things that come in sets of 24 things that come in groups of 20 things that come in groups of 21 things that come in groups of 2 to 10 things that come in sets of 25 things that come in sets of 22 things in pairs of 2
