Rhubarb or blueberry

Now we are looking on the crossword clue: Rhubarb or blueberry.
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Possible Answers: PIE.

Random information on the term “PIE”:

The Indo-European languages include some 439 (SIL estimate[1]) languages and dialects spoken by about three billion people, including most of the major language families of Europe and western Asia, which belong to a single superfamily. Each subfamily in this list contains many subgroups and individual languages.
Taken from Wikipedia