Magical phrase

I think it could be either:

Which length description are you looking for?:

4,6

10*

open sesame

'magical phrase' is the definition.
(Ali Baba and the Forty Thieves password)

This is all the clue.

(Other definitions for open sesame that I've seen before include "free entry" , "door-unlocking spell" , "Spell from Ali Baba and the Forty Thieves" , "Magic password" , "Words of Ali Baba" .)

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