4 20 b b in a p?

Black birds baked in a pie.

4 and 20 blackbirds baked in a pie schwazoo

True. Sing a song of sixpence,a pocketful of rye.Four and twenty BlackBirds,Baked in a Pie.

My best guess is the in should be and, so it would be Four and Twenty Black Birds in a Pie

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