ISOPLETH

eh el es et he hi ho is it li lo oe oh oi op os pe pi sh si so ti to

els eth hep hes het hie hip his hit hoe hop hos hot its lei les let lie lip lis lit lop lot oes ohs oil ole ope ops opt ose peh pes pet phi pht pie pis pit poh poi pol pot psi pst sei sel set she sip sit sol sop sot tel the tho tie til tip tis toe top

elhi epos eths heil helo help hest hets hies hilt hips hist hits hoes hole holp hols holt hope hops hose host hots isle leis lept lest lets lies lipe lips lisp list lite lits lope lops lose lost loth loti lots oils oles opes opts pehs pelt peso pest pets phis phot pies pile pish piso pith pits plie plot poet pois pole pols pose posh post pots sept ship shit shoe shop shot silo silt sipe site sith slip slit sloe slop slot soil sole soli soph soth spit spot step stop tels thio this ties tile tils tips toes toil tole tope toph topi tops tosh