fff ffo ffr ffs ffu fof foo for fos fou frf fro frr frs fru fsf fso fsr fss fsu fuf fuo fur fus fuu of- off ofo ofr ofs ofu oo- oof ooo oor oos or- orf oro orr ors oru os- osf oso osr oss osu ou- ouf ouo our ous rff rfo rfr rfs rfu rof roo ror ros rou rrf rrr rrs rru rsf rso rsr rss rsu ruf ruo rur rus ruu sff sfo sfr sfs sfu sof soo sor sos sou sr- srf sro srr srs ss- ssf sso ssr sss ssu suf suo sur sus suu uff ufo ufr ufs ufu uoo uor uos ur- urf uro urr urs uru usf uso usr uss usu uur uus uuu

-ous ffff ffrr ffss fofo foof foos for- foro forr fors foso foss four fous fros frou frso fsfo fssf fuff fufu fuor fur- furo furr furs fuso fuss fusu off- offo offr offs offu ofor ofus ooff oofs oooo ooos oous orff orfs orfu oro- orof oror oros orro orrs orso orsu orus osoo osor osos osro osso ossu ouff our- ouro ours ouu- roff rofo roof roor roos roro roru roso ross rouf rous rrrr rsos ruff rufo ruro rurs ruru ruso russ rusu s-os sfor sfos sfro sfss sfsu sofo soof soor soos soro sorr sors soru soso soss souf sour sous sros ssrs sssf ssss suf- suff sufr sufs sufu suor suos sur- surf suro surr surs suru sus- suso suss susu suus ufos uofo uor- urff uro- uroo urso urss ursu urur urus usfs usos ussf ussr usss ussu usus uuuu

fofos foros forro forso forss forur forus fouro fours fu-fu fuffs furo- furor furrs furus fuso- fusor fusus offof ofosu ofour ooooo orfor oroso orosu oruro ososo ossos ossur osusu ouoro ro-ro rofor roofs rosso rosss rosu rsssf ruffo ruffs rufo- rufus rusor russo s-o-r sfouf so-so sooru soror soros sorso sorsu sorus soss- sosus souff sours sous- sroof sssss suffr suffs surfs surur surus susso susus ufofu uros urour urous ursus usfor usour uuuuu

foofoo foofur forros fosso fossor foufou fourof fourou furfur furors furour furrfu fusors oooooo orrour ossous ououso ousrou rofors ruffus russo- russus soosoo sorors sorous sorrus sorsor sourou sousou sssfrs suroso susurr

foo-foo fossors fou-fou furrour off-off sorfors sou-sou sssssss suursoo usurous

fosforus froufrou sussurus susurrus

four-four frou-frou froufrous furfurous sous-sous susurrous

frou-frous