l-pop lollo lolol loopt lotor lotto ooooo oploo oplot oppol opto- optot optto orlop ortoo otolo ototo otpor ploop ploot plopp plott po-po pollo polop poopo poort poplr popop poppo poro- porro porto potoo potop potor potro potto proll prolo proor proot prop- propl propp propr propt prot- proto prtor ptpro ptprr ptprt ro-ro rollo roto- rotol rotor rotot rotto rprop rptor t-pop t-top tollo toloo tolor toolt toplo topo- topol topor topot toppo topto torpo torro torto toto- totoo totop tprot troll troop trop- tropo trott ttttt