b-p bbb bbc bbo bbp bbr bbs bbt bby bcb bcc bco bcp bcr bcs bct bcy bob boc boo bop bor bos bot boy bpb bpc bpo bpp bpr bps bpt bpy brb bro brp brr brs brt bry bsb bsc bso bsp bsr bss bst bsy btb btc bto btp btr bts btt bty by- byc byo byp byr bys byt c-- cbb cbc cbo cbp cbr cbs cbt cby ccb ccc cco ccp ccr ccs cct co- cob coc coo cop cor cos cot coy cpb cpc cpo cpp cpr cps cpt crb crc cro crp crr crs crt cry csb csc cso csp csr css cst csy ctb ctc cto ctp ctr cts ctt cty cyb cyc cyo cyp cyr cys cyt ob- obb obc obo obp obr obs obt oby oc- ocb occ oco ocp ocr ocs oct oo- oob ooc ooo oop oor oos oot op- opb opc opo opp opr ops opt opy or- orb orc oro orp orr ors ort ory os- osb osc oso osp osr oss ost ot- otb otc oto otp otr ots ott oyo oys p-p pbb pbc pbo pbp pbr pbs pbt pby pcb pcc pco pcp pcr pcs pct pob poc poo pop por pos pot poy ppb ppc ppo ppp ppr pps ppt prb prc pro prp prr prs prt pry ps- psb psc pso psp psr pss pst psy pt- ptb ptc pto ptp ptr pts ptt pty py- pyb pyc pyo pyr pys pyt rbb rbc rbo rbp rbr rbs rbt rcb rcc rco rcp rcr rcs rct rob roc roo rop ror ros rot roy rpb rpc rpo rpp rpr rps rpt rrb rrc rrp rrr rrs rrt rsb rsc rso rsp rsr rss rst rtb rtc rto rtp rtr rts rtt rty ry- ryc ryo ryr rys ryy sbb sbc sbo sbp sbr sbs sbt sby scb scc sco scp scr scs sct sob soc soo sop sor sos sot soy spb spc spo spp spr sps spt spy sr- srb src sro srp srr srs srt sry ss- ssb ssc sso ssp ssr sss sst stb stc sto stp str sts stt sty sy- syb syc syp syr sys syt tbb tbc tbo tbp tbr tbs tbt tcb tcc tco tcp tcr tcs tct to- tob toc too top tor tos tot toy tpb tpc tpo tpp tpr tps tpt trb trc tro trp trr trs trt try tsb tsc tso tsp tsr tss tst tsy ttb ttc tto ttp ttr tts ttt tty tyc tyo typ tyr tys tyt ybc ybp ybr ybs yby ycc yco ycp ycs ycy yob yoc yoo yop yor yos yot yoy ypo yps yrc yro yrp yrs yrt ysb ysc yso ysp ysr yss yst ysy ytc yto ytp ytr yts ytt yyb yyc yys yyt yyy