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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def switchmap(source, func, *more_sources):
 """Apply a given function that creates a sequence from the elements of one or several asynchronous sequences and generate the elements of the most recently created sequence. The function is applied as described in `map`, and must return an asynchronous sequence. Errors raised in a source or output sequence (that was not already closed) are propagated. """

    return switch.raw(combine.smap.raw(source, func, *more_sources))