 8 are self-dual ("p"="r" and "a"="b"), while 14 exist as dual polytope pairs.Three are entirely real ("p"="q"="r"=2).Coxeter symbolizes 12 of them as δ or "p"{4}2{4}"r" is the regular form of the product apeirotope δ × δ or "p"{"q"}"r" × "p"{"q"}"r", where "q" is determined from "p" and "r".