bbbb bbbs bblb bbls blls blsp blss blub blup blus bpsu bspp bsup bubb bubs bubu bulb bull buls bulu bups buss busu buus llbs llll llps lppl lpss lsbu lspl lssp lubs lull lulu lupu luss luup pblu pbsp plpp plss plup plus pppp ppps ppss pspp psps publ pubs pubu pull pulp puls pulu pupl pups pupu puss sbbs sbsp sbus slbp sllp slpp slps slsu slub slup splp spls spps spsp spss spus sslp sspl ssps sssb ssss sub- subb subl subs sul- sull sulp sulu sup- supp sups sus- susp suss susu suus ubls ulul ulus uplb uppp uppu upup usbl usbs uslp uslu uspp usps ussb usss ussu usul usus uulu uuuu