If GH can stand for P as in Hiccough,
and if OUGH can stand for O as in Dough,
and if PHTH can stand for T as in Phthisis,
and if EIGH can stand for A as in Neighbor,
and if TTE can stand for T as in Gazette,
and if EAU can stand for O as in Plateau,
then the right way to spell POTATO should be: "GHOUGHPHTHEIGHTTEEAU"