<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def subs2seqs(self) -> Dict[str, List[str]]: """A |collections.defaultdict| containing the node-specific information provided by XML `sequences` element. node ['sim', 'obs'] """

        subs2seqs = collections.defaultdict(list)
        nodes = find(self.find('sequences'), 'node')
        if nodes is not None:
            for seq in nodes:
                subs2seqs['node'].append(strip(seq.tag))
        return subs2seqs