<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def getsubtables(self):
 """Get the names of all subtables."""

        keyset = self.getkeywords()
        names = []
        for key, value in keyset.items():
            if isinstance(value, str) and value.find('Table: ') == 0:
                names.append(_do_remove_prefix(value))
        return names