a-a a-b a-i a-t aaa aab aai aak aao aap aar aat ab- aba abb abi abk abo abp abr abt ai- aia aib aii aik aio aip air ait aka akb aki akk ako akp akr aoa aob aoi aok aoo aop aor aot ap- apa apb api apk apo app apr apt ar- ara arb ari ark aro arp arr art at- ata atb ati ato atp atr att b-p baa bab bai bak bao bap bar bat bba bbb bbi bbk bbo bbp bbr bbt bi- bia bib bii bik bio bip bir bit bka bkb bkk bko bkp bkr bkt boa bob boi bok boo bop bor bot bpa bpb bpi bpo bpp bpr bpt bra brb bri brk bro brp brr brt bta btb bti btk bto btp btr btt ia- iaa iab iai iao iap iar iat iba ibb ibi ibk ibo ibp ibr ibt iia iib iii iio iip iir iit ika ikb iki ikk iko ikr ikt io- ioa iob ioi ioo iop ior iot ipa ipb ipi ipo ipp ipr ipt ir- ira irb iri irk iro irp irr irt ita itb iti itk ito itp itt k-t ka- kaa kab kai kak kao kap kar kat kba kbb kbi kbk kbo kbp kbr kia kib kii kik kio kip kir kit kkb kki kkk kkp kkr kkt koa kob koi kok koo kop kor kot kpa kpi kpk kpo kpp kpr kpt kra kri krk kro krp krr krt kta ktb ktk kto ktp ktr ktt o-i oaa oab oai oak oao oap oar oat ob- oba obb obi obk obo obp obr obt oia oib oii oik oio oip oir oit oka okb oki okk oko okp okr oo- ooa oob ooi ook ooo oop oor oot op- opa opb opi opk opo opp opr opt or- ora orb ori ork oro orp orr ort ot- ota otb oti otk oto otp otr ott p-p paa pab pai pak pao pap par pat pba pbb pbi pbk pbo pbp pbr pbt pia pib pii pik pio pip pir pit pka pkb pki pko pkp pkr pkt poa pob poi pok poo pop por pot ppa ppb ppi ppk ppo ppp ppr ppt pra prb pri prk pro prp prr prt pt- pta ptb pti ptk pto ptp ptr ptt ra- raa rab rai rak rao rap rar rat rba rbb rbi rbk rbo rbp rbr rbt ria rib rii rik rio rip rir rit rkb rkk rko rkp rkt roa rob roi rok roo rop ror rot rpa rpb rpi rpk rpo rpp rpr rpt rra rrb rri rrk rrp rrr rrt rta rtb rti rtk rto rtp rtr rtt taa tab tai tak tao tap tar tat tba tbb tbi tbk tbo tbp tbr tbt tia tib tii tik tio tip tir tit tka tkb tkk tko tkp tkr tkt to- toa tob toi tok too top tor tot tpa tpb tpi tpk tpo tpp tpr tpt tra trb tri trk tro trp trr trt tta ttb tti ttk tto ttp ttr ttt