Usually 3 & it is usually repetitive.
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A few sites say that the Moldau is in a rondo-like form with eight sections. Another says it is in ternary form. I guess, then, it has no clear-cut form, but the fact that the main theme recurs gives more reason for it to be in rondo.
Mozart's Rondo Alla Turca (K 331)
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BACABA is the structure
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