<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _reducedProtToPeps(protToPeps, proteins):
 """Returns a new, reduced "protToPeps" dictionary that does not contain entries present in "proteins". :param protToPeps: dict, for each protein (=key) contains a set of :param proteins: a list of proteinSet :returns: dict, protToPeps not containing entries from "proteins" """

    return {k: v for k, v in viewitems(protToPeps) if k not in proteins}