def check_all_SJs_known(novelty):
    """ Given a list in which each element represents the novelty (1) or 
        known-ness of a transcript edge (0), determine whether all of the
        introns are known or not. Return True if all are known, and False 
        otherwise. Input should not include first or last exon. If there is
        only one entry, then that means there is one splice junction (two exons)"""

    if len(novelty) == 1:
        return novelty[0] == 0

    introns = novelty[::2]
        
    if sum(introns) > 0:
        return False
    else:
        return True