ffff ffps ffrr ffss fnrs fnsp fofo fono fons foof foon foos fopp fops for- forn foro forr fors foso foss fprf frns fron frop fros frps frso fsfo fspf fssf fssp nfff nfon nfps nfrs nfsr nnnn nnos nnpr nnss non- nonn nono nons noo- noon nooo noop noor noos nops nor- norf norn noro norr nors nos- noss npss nron nrpn nrps nrsp nsfs nsnr nsof nsos nsps nssf nsso nssp nssr nsss off- offo offr offs ofno ofor onno onon onor onos onso ooff oofs oons oooo ooos oops opo- opon opor opos oppo opps orff orfs orno orns oro- orof oron oror oros orps orro orrs orso osno osnr osoo osor osos osro osso pfff pffr pfps pnon pnpo pnpp pnro poff pono ponp pons poof poon poop poor poos pop- popo popp pops porn poro porr pors posn poso poss ppos pppn pppo pppp ppps pprf ppsf ppss prfs prnp pro- prof pron proo prop pros prps prrs prso prss psfs psnr pson psos pspp pspr psps psrp psso rnsp roff rofo rono rons roof roon roop roor roos ropo rops roro roso rosp ross rpof rpon rpos rppn rpps rrrr rrsp rsnn rsno rsnr rsos rspo rsps s-os sfor sfos sfro sfss snns snoo snop snor snos snpo snpp snrs sofo son- sono sons soof soon soop soor soos sopo sopp sops sorn soro sorr sors soso soss spfs spns spon spoo spop spor spos sppf spps spro sprs spso spsp spss srnn srno sros srps srsp ssfp ssns ssop sspf sspo ssps ssrs sssf ssss