eeee eefe eero eeze efeo efor efze eore erer erez eroe eroo erre erro ezer ezzo feer fefe feff fefo feof fere fero ferr ferz ffee ffff ffrr foer fofo foof for- fore foro forr free freo froe o-eo oere ofer off- offe offo offr ofor ofoz ofre ooer ooff oooo oore ooze ore- oreo orer orfe orff oro- oroe orof oror oroz orro orzo ozee ozer reef refe reff refr reof rere rero reze rfef roer rofe roff rofo roof roor rooz rore roro roze rozz rrrr z-ro zeff zerf zero zeze zoff zoo- zore zoro zozo zrze zzzz