Subfigures in beamer documents

I'm using beamer package to produce slides. I put many figures on a slide by using the subfigure p开发者_C百科ackage. The problem is that for captions, the subfigure are labeled "a", "b".. "m", "n" and so on, for subfigures appearing on different slides. How could I reset the subfigure numbering when passing to a new slide?

Thanks in advance.

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Solved: added \setcounter{subfigure}{0} before each \begin{figure}.