a-a a-b a-t aaa aab aao aap aar aas aat aay ab- aba abb abo abp abr abs abt aby aoa aob aoo aop aor aos aot ap- apa apb apo app apr aps apt apy ar- ara arb aro arp arr ars art ary as- asa asb aso asp asr ass ast asy at- ata atb ato atp atr ats att ay- aya ayo ayp ayr ays ayt b-p baa bab bao bap bar bas bat bay bba bbb bbo bbp bbr bbs bbt bby boa bob boo bop bor bos bot boy bpa bpb bpo bpp bpr bps bpt bpy bra brb bro brp brr brs brt bry bsa bsb bso bsp bsr bss bst bsy bta btb bto btp btr bts btt bty by- bya byo byp byr bys byt oaa oab oao oap oar oas oat ob- oba obb obo obp obr obs obt oby oo- ooa oob ooo oop oor oos oot op- opa opb opo opp opr ops opt opy or- ora orb oro orp orr ors ort ory os- osa osb oso osp osr oss ost ot- ota otb oto otp otr ots ott oya oyo oys p-p paa pab pao pap par pas pat pay pba pbb pbo pbp pbr pbs pbt pby poa pob poo pop por pos pot poy ppa ppb ppo ppp ppr pps ppt pra prb pro prp prr prs prt pry ps- psa psb pso psp psr pss pst psy pt- pta ptb pto ptp ptr pts ptt pty py- pya pyb pyo pyr pys pyt ra- raa rab rao rap rar ras rat ray rba rbb rbo rbp rbr rbs rbt roa rob roo rop ror ros rot roy rpa rpb rpo rpp rpr rps rpt rra rrb rrp rrr rrs rrt rsa rsb rso rsp rsr rss rst rta rtb rto rtp rtr rts rtt rty ry- rya ryo ryr rys ryy saa sab sao sap sar sas sat say sba sbb sbo sbp sbr sbs sbt sby soa sob soo sop sor sos sot soy spa spb spo spp spr sps spt spy sr- sra srb sro srp srr srs srt sry ss- ssa ssb sso ssp ssr sss sst sta stb sto stp str sts stt sty sy- sya syb syp syr sys syt taa tab tao tap tar tas tat tay tba tbb tbo tbp tbr tbs tbt to- toa tob too top tor tos tot toy tpa tpb tpo tpp tpr tps tpt tra trb tro trp trr trs trt try tsa tsb tso tsp tsr tss tst tsy tta ttb tto ttp ttr tts ttt tty tya tyo typ tyr tys tyt yaa yab yao yap yar yas yat yay ybp ybr ybs yby yob yoo yop yor yos yot yoy ypa ypo yps yra yro yrp yrs yrt ysa ysb yso ysp ysr yss yst ysy yta yto ytp ytr yts ytt yyb yys yyt yyy