'Return list of morfs where the morf name does not begin
with any one of the omit_prefixes.'

def filter_by_prefix(self, morfs, omit_prefixes):

    filtered_morfs = []
    for morf in morfs:
        for prefix in omit_prefixes:
            if self.morf_name(morf).startswith(prefix):
                break
        else:
            filtered_morfs.append(morf)
    return filtered_morfs
