a-a a-b a-i a-t aaa aab aai aak aao aap aar aas aat ab- aba abb abi abk abo abp abr abs abt ai- aia aib aii aik aio aip air ais ait aka akb aki akk ako akp akr aks aoa aob aoi aok aoo aop aor aos aot ap- apa apb api apk apo app apr aps apt ar- ara arb ari ark aro arp arr ars art as- asa asb asi ask aso asp asr ass ast at- ata atb ati ato atp atr ats att b-p baa bab bai bak bao bap bar bas bat bba bbb bbi bbk bbo bbp bbr bbs bbt bi- bia bib bii bik bio bip bir bis bit bka bkb bkk bko bkp bkr bks bkt boa bob boi bok boo bop bor bos bot bpa bpb bpi bpo bpp bpr bps bpt bra brb bri brk bro brp brr brs brt bsa bsb bsi bsk bso bsp bsr bss bst bta btb bti btk bto btp btr bts btt ia- iaa iab iai iao iap iar ias iat iba ibb ibi ibk ibo ibp ibr ibs ibt iia iib iii iio iip iir iis iit ika ikb iki ikk iko ikr iks ikt io- ioa iob ioi ioo iop ior ios iot ipa ipb ipi ipo ipp ipr ips ipt ir- ira irb iri irk iro irp irr irs irt is- isa isb isi isk iso isp isr iss ist ita itb iti itk ito itp its itt k-t ka- kaa kab kai kak kao kap kar kas kat kba kbb kbi kbk kbo kbp kbr kbs kia kib kii kik kio kip kir kis kit kkb kki kkk kkp kkr kks kkt koa kob koi kok koo kop kor kos kot kpa kpi kpk kpo kpp kpr kps kpt kra kri krk kro krp krr krs krt ksa ksb ksi ksk kso ksp ksr kss kst kta ktb ktk kto ktp ktr kts ktt o-i oaa oab oai oak oao oap oar oas oat ob- oba obb obi obk obo obp obr obs obt oia oib oii oik oio oip oir ois oit oka okb oki okk oko okp okr oks oo- ooa oob ooi ook ooo oop oor oos oot op- opa opb opi opk opo opp opr ops opt or- ora orb ori ork oro orp orr ors ort os- osa osb osi osk oso osp osr oss ost ot- ota otb oti otk oto otp otr ots ott p-p paa pab pai pak pao pap par pas pat pba pbb pbi pbk pbo pbp pbr pbs pbt pia pib pii pik pio pip pir pis pit pka pkb pki pko pkp pkr pks pkt poa pob poi pok poo pop por pos pot ppa ppb ppi ppk ppo ppp ppr pps ppt pra prb pri prk pro prp prr prs prt ps- psa psb psi psk pso psp psr pss pst pt- pta ptb pti ptk pto ptp ptr pts ptt ra- raa rab rai rak rao rap rar ras rat rba rbb rbi rbk rbo rbp rbr rbs rbt ria rib rii rik rio rip rir ris rit rkb rkk rko rkp rks rkt roa rob roi rok roo rop ror ros rot rpa rpb rpi rpk rpo rpp rpr rps rpt rra rrb rri rrk rrp rrr rrs rrt rsa rsb rsi rsk rso rsp rsr rss rst rta rtb rti rtk rto rtp rtr rts rtt saa sab sai sak sao sap sar sas sat sba sbb sbi sbk sbo sbp sbr sbs sbt sia sib sii sik sio sip sir sis sit sk- ska skb ski skk sko skp skr sks skt soa sob soi sok soo sop sor sos sot spa spb spi spk spo spp spr sps spt sr- sra srb sri srk sro srp srr srs srt ss- ssa ssb ssi ssk sso ssp ssr sss sst sta stb sti stk sto stp str sts stt taa tab tai tak tao tap tar tas tat tba tbb tbi tbk tbo tbp tbr tbs tbt tia tib tii tik tio tip tir tis tit tka tkb tkk tko tkp tkr tks tkt to- toa tob toi tok too top tor tos tot tpa tpb tpi tpk tpo tpp tpr tps tpt tra trb tri trk tro trp trr trs trt tsa tsb tsi tsk tso tsp tsr tss tst tta ttb tti ttk tto ttp ttr tts ttt