Why Solo/Duo queue and not just Solo queue?

There is something I do not understand... maybe someone can explain it to me. Why are we getting solo / duo queue when we have flex queue? In Flex queue you can queue with 1 - 5 players right? So if you want to play with a friend in ranked mode you can queue in flex. Why then is the solo queue also a duo queue? I don't get it. Why don't they make solo/duo queue... just solo queue?
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