lets say (and i know nothing of pieds abbreviations but lets just say..)

heres how a punnent would look if

PP = male pied
nn= normal female

-----------------------
--- | P | P
-------------------------------------
n | Pn | Pn
----------------------------------
n | Pn | Pn




pns are hets. they dont show any pied


| P | P
-------------------------------------
P | PP | PP
----------------------------------
n | Pn | Pn