human
Write me a Python code to find all tables which depend on the given tables given the following:
Complete the below
def find_dependent_tables(tables, graph=None):

    ''''Recursively find all tables which depend on the given tables.
    The returned set does not include the original tables.'
    '''
assistant
#Here is Python code to find all tables which depend on the given tables.
    if (graph is None):
        graph = _pokedex_graph
    tables = list(tables)
    dependents = set()
    def add_dependents_of(table):
        for dependent_table in graph.get(table, []):
            if (dependent_table not in dependents):
                dependents.add(dependent_table)
                add_dependents_of(dependent_table)
    for table in tables:
        add_dependents_of(table)
    dependents -= set(tables)
    return dependents