ffff fftf floo flop flot flou fluf fluo fofo foll folo folt foof fool foot fopp foto fotp fott foul foup fout ft-l ftop fuff fufu full fulu futo futu lftp llll lloo loff loft loll lolo loof lool loop loot lopp lopu lotl loto lott loul loup lout louu lpfp lpft lppl luff luft lufu lull lulu lupo lupu luup off- offo offu oftp ollo olof olot oltu ooff oolo oooo ootp opo- oppo opto otfp oto- otof otoo otpp otto ottu ouff oulu out- outo ouu- pfff pfft plff ploo plop plot plou plpp pltf pltt plup poff poll polo polt polu poof pool poop poot pop- popo popp popt potf poto pott potu pouf poul poup pout pplo pppo pppp pptt ptol ptop puff puft pull pulo pulp pult pulu pupl pupu put- puto putt putu tfot tfpt tftp toff tofo toft tofu tol- toll tolo tolt tolu toof tool toot top- topf topo topp topt topu toto tott toul toup tout tpol tppp tptp tput ttff ttop tttt ttul tuff tufo tuft tufu tull tulo tulp tulu tupo tupu tutl tuto tutt tutu tuuo uftp ulft ullo ulo- ulto ultt ulul uofl uofo uplo uppp uppu uptl upto upup utfo utto uttu uulu uutf uuuu