'TAGX block for the Primary index header of a periodical'

@property
def periodical(self):

    list(map(self.add_tag, (1, 2, 3, 4, 5, 21, 22, 23, 0, 69, 70, 71, 72, 73, 0)))
    return (self.header(2) + bytes(self.byts))
