bbbb bbbs bbfn bbin bffs bfsi bibb bibi bibs biff bifi biin biis bin- bini binn bins binu bis- biss bisu bnib bnin bnss bsff bsfs bsin bsns bubb bubi bubs bubu buff buif buin buis buiu bunb buni bunn buns bunu busi buss busu buus fbis fbus ffff ffii ffss ffun fibs fiff fifi fiii fini finn fins fisi fiss fisu fnuf fsfi fssf fubb fubs fubu fuff fufu funf funs fusi fuss fusu ibfi ibis ibns ibsf ibsn ibss ibus ifbb ifis ifni ifns ifsb iiii iiis iisi iisu infi infs inis inni inns innu inss insu inui inun inus isbn isin isis issf issi isss issu isus iuiu iuss n-ii nbuf nfff nfib nfsu nibi nibs niff niiu nini nins nisi niss nisu nnnn nnss nsfs nsin nsis nssb nssf nsss nsub nubi nubs nuff nuin nunn nuns nusi nuss nusu s-ib s-ii sbbs sbsi sbus sfnb sfss sfsu sibi sibs sibu siff sifu sini sinn sins sinu sisi siss sisu siui sius snfu snib snns snub snus ssbn ssin ssis ssns sssb sssf sssi ssss sub- subb subi subs suf- suff sufi sufs sufu suin suis sun- sunb suni sunn suns sunu sus- susi suss susu suus ubbi ubii ubis uni- unif unii unin unis unni unns uns- unus usbs usfi usfs usif usin usis usnu ussb ussf usss ussu usui usun usus uuni uusi uuuu