Refrain syllables (3-2-2)

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3-2-2

3-2

4* 5* 7*

tra-la

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(Other definitions for tra-la that I've seen before include "Expression of joy or gaiety, musically" , "Sound made when humming a song" , "Joyous refrain in song" , "The flowers that bloom in the spring -- -- (Mikado)" , "Ironic; expression of joy or gaiety" .)

I've seen this clue in The Wall Street Journal, the Universal and The New York Times.

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