def get_curr_trans(prev_id, prev_type, curr_id, curr_type) -> str:
    """
    Evaluate the current transition based on the information from the current and the previous transaction
    :param prev_id: id of the previous transaction
    :param prev_type: type of the previous transaction
    :param curr_id: id of the current transaction
    :param curr_type: type of the current transaction
    :returns sta->E string, representing a transition from the start event to an event E or E->E' if not a start event
    """
    if float(prev_id) != float(curr_id):
        return 'sta->{}'.format(curr_type)
    else:
        return '{}->{}'.format(prev_type, curr_type)