b-u bbb bbo bbt bbu bbw bob boo bot bou bow boz btb bto btt btu btw btz bub buo but buu buw buz bwb bwo bwu bzo bzu bzz ob- obb obo obt obu obw oo- oob ooo oot oow ot- otb oto ott otu otw otz ou- ouo out owb owo owt owu oww ozo ozt ozu ozw ozz tbb tbo tbt tbu tbz to- tob too tot tou tow toz ttb tto ttt ttu ttw tub tuo tut tuu tuz twb two twt twu tww tzu ubb ubo ubt ubu ubw uob uoo uot uow utb uto utt utu utz uut uuu uwb uww uzb uzo uzu wbb wbo wbt wbw wbz wob woo wot wou wow woz wtb wto wtt wtu wtw wtz wub wuo wut wuz wwo wwt wwu www wzt wzu zbb zbt zbw zo- zob zoo zot zou zow zub zut zuz zzt zzz