'Check if the given `element\' is already present in the lookup table.
Return `True\' if `element\' is already in the lookup table and `False\'
otherwise.'

def isPresent(self, element):

    log.debug(('Looking    for    existing    element    in    size-%d    lookup    table.' % len(self.table)))
    self.prune()
    return (element in self.table)
