-up b-p b-u bbb bbo bbp bbr bbs bbt bbu bby bob boo bop bor bos bot bou boy bpb bpo bpp bpr bps bpt bpu bpy brb bro brp brr brs brt bru bry bsb bso bsp bsr bss bst bsu bsy btb bto btp btr bts btt btu bty bub buo bup bur bus but buu buy by- byo byp byr bys byt byu ob- obb obo obp obr obs obt obu oby oo- oob ooo oop oor oos oot op- opb opo opp opr ops opt opy or- orb oro orp orr ors ort oru ory os- osb oso osp osr oss ost osu ot- otb oto otp otr ots ott otu ou- ouo oup our ous out oyo oys p-p pbb pbo pbp pbr pbs pbt pbu pby pob poo pop por pos pot pou poy ppb ppo ppp ppr pps ppt ppu prb pro prp prr prs prt pru pry ps- psb pso psp psr pss pst psu psy pt- ptb pto ptp ptr pts ptt ptu pty pub pup pur pus put puu puy py- pyb pyo pyr pys pyt pyu rbb rbo rbp rbr rbs rbt rbu rob roo rop ror ros rot rou roy rpb rpo rpp rpr rps rpt rpu rrb rrp rrr rrs rrt rru rsb rso rsp rsr rss rst rsu rtb rto rtp rtr rts rtt rtu rty rub ruo rup rur rus rut ruu ruy ry- ryo ryr rys ryu ryy sbb sbo sbp sbr sbs sbt sbu sby sob soo sop sor sos sot sou soy spb spo spp spr sps spt spu spy sr- srb sro srp srr srs srt sry ss- ssb sso ssp ssr sss sst ssu stb sto stp str sts stt stu sty sub suo sup sur sus sut suu suy sy- syb syp syr sys syt syu tbb tbo tbp tbr tbs tbt tbu to- tob too top tor tos tot tou toy tpb tpo tpp tpr tps tpt tpu trb tro trp trr trs trt tru try tsb tso tsp tsr tss tst tsu tsy ttb tto ttp ttr tts ttt ttu tty tub tuo tup tur tus tut tuu tuy tyo typ tyr tys tyt ubb ubo ubp ubr ubs ubt ubu uby uob uoo uop uor uos uot up- upb upo upp upr ups upt upu ur- urb uro urp urr urs urt uru ury usb uso usp usr uss ust usu utb uto utp utr uts utt utu uty uur uus uut uuu uyo uys uyu ybp ybr ybs yby yob yoo yop yor yos yot you yoy ypo yps ypu yro yrp yrs yrt yru ysb yso ysp ysr yss yst ysu ysy yto ytp ytr yts ytt ytu yuo yup yur yus yut yuu yuy yyb yys yyt yyu yyy