f-prot foofoo forlot forrot forton fotron frollo frootl ftroop lloro lo-pro lofton lollop lonnol lontor looloo loplop lopoff lorton lotorp lotpot n-toon nofool noforn non-no non-op nonono nonoon nonpro noonoo noonor noonto noroff noroof norton notfor notron notton nottoo offton ofpoor oftfor oloron on-off onfoot onloft onroll oofotr oooooo oporto optfor optoro orloff oroton ottoor plonno plotno plplot polpol polpot polron polton ponton poopoo popfor popoff popopo poporo poppop poptop porno- porron portof porton potron potton pottop pppppp profor pronto proto- proton r-loop roflol rollon rollot roloff ronnon ronron rootof rooton rotolo rotton to-fro to-on toforn tollon tolono tolton tonlon tonono tonoro tonpon tonton tootoo topoff toppop toprol topton torolf tororo torpor tortor totnor totopo totoro totrot trollt tronto tropo- troppo trotro