def get_intersection(dictionary1, dictionary2):
    """Get a new dictionary key --> {value set} with the keys of the first dictionary that appear in the second"""
    result = {}
    for k1, s1 in dictionary1.items():
        for v1 in s1:
            if k1 in dictionary2.keys() and v1 in dictionary2[k1]:
                result.setdefault(k1, set()).add(v1)
    return result