b-u bbb bbg bbr bbs bbt bbu bgb bgg bgr bgs bgt bgu brb brg brr brs brt bru bsb bsg bsr bss bst bsu btb btg btr bts btt btu bub bug bur bus but buu gbg gbr gbs gbt gbu ggb ggg ggr ggs ggt ggu grb grg grr grs grt gru gsb gsg gsr gss gst gsu gtb gtg gtr gts gtt gtu gu- gub gug gur gus gut guu rbb rbg rbr rbs rbt rbu rgb rgg rgr rgs rgt rrb rrg rrr rrs rrt rru rsb rsg rsr rss rst rsu rtb rtg rtr rts rtt rtu rub rug rur rus rut ruu sbb sbg sbr sbs sbt sbu sgb sgg sgr sgs sgt sgu sr- srb srg srr srs srt ss- ssb ssg ssr sss sst ssu stb stg str sts stt stu sub sug sur sus sut suu tbb tbg tbr tbs tbt tbu tgb tgg tgr tgs tgt tgu trb trg trr trs trt tru tsb tsg tsr tss tst tsu ttb ttg ttr tts ttt ttu tub tug tur tus tut tuu ubb ubg ubr ubs ubt ubu ugb ugg ugr ugs ugt ugu ur- urb urg urr urs urt uru usb usg usr uss ust usu utb utr uts utt utu uug uur uus uut uuu