a-a a-b a-i a-t aaa aab aaf aai aak aao aar aas aat ab- aba abb abf abi abk abo abr abs abt af- afa afb aff afi afk afo afr afs aft ai- aia aib aif aii aik aio air ais ait aka akb aki akk ako akr aks aoa aob aof aoi aok aoo aor aos aot ar- ara arb arf ari ark aro arr ars art as- asa asb asf asi ask aso asr ass ast at- ata atb atf ati ato atr ats att baa bab baf bai bak bao bar bas bat bba bbb bbf bbi bbk bbo bbr bbs bbt bfa bfb bff bfi bfo bfr bfs bft bi- bia bib bif bii bik bio bir bis bit bka bkb bkf bkk bko bkr bks bkt boa bob bof boi bok boo bor bos bot bra brb brf bri brk bro brr brs brt bsa bsb bsf bsi bsk bso bsr bss bst bta btb btf bti btk bto btr bts btt faa fab faf fai fak fao far fas fat fba fbb fbf fbi fbk fbo fbr fbs fbt ffa fff ffi ffk ffo ffr ffs fft fia fib fif fii fik fir fis fit fka fkb fkf fki fkk fkt foa fob fof foi fok foo for fos fot fra frb frf fri frk fro frr frs frt fsa fsb fsf fsi fsk fso fsr fss fst fta ftb ftf fti ftk fto ftr fts ftt i-f ia- iaa iab iaf iai iao iar ias iat iba ibb ibf ibi ibk ibo ibr ibs ibt ifa ifb iff ifi ifo ifr ifs ift iia iib iif iii iio iir iis iit ika ikb ikf iki ikk iko ikr iks ikt io- ioa iob iof ioi ioo ior ios iot ir- ira irb irf iri irk iro irr irs irt is- isa isb isf isi isk iso isr iss ist ita itb itf iti itk ito its itt k-t ka- kaa kab kaf kai kak kao kar kas kat kba kbb kbf kbi kbk kbo kbr kbs kfa kff kfi kfo kfs kia kib kif kii kik kio kir kis kit kkb kki kkk kkr kks kkt koa kob kof koi kok koo kor kos kot kra krf kri krk kro krr krs krt ksa ksb ksf ksi ksk kso ksr kss kst kta ktb ktf ktk kto ktr kts ktt o-i oaa oab oaf oai oak oao oar oas oat ob- oba obb obf obi obk obo obr obs obt of- ofa ofb off ofi ofo ofr ofs oft oia oib oif oii oik oio oir ois oit oka okb oki okk oko okr oks oo- ooa oob oof ooi ook ooo oor oos oot or- ora orb orf ori ork oro orr ors ort os- osa osb osf osi osk oso osr oss ost ot- ota otb otf oti otk oto otr ots ott ra- raa rab raf rai rak rao rar ras rat rba rbb rbf rbi rbk rbo rbr rbs rbt rfa rfb rff rfi rfk rfo rfr rfs rft ria rib rif rii rik rio rir ris rit rkb rkf rkk rko rks rkt roa rob rof roi rok roo ror ros rot rra rrb rrf rri rrk rrr rrs rrt rsa rsb rsf rsi rsk rso rsr rss rst rta rtb rtf rti rtk rto rtr rts rtt saa sab saf sai sak sao sar sas sat sba sbb sbf sbi sbk sbo sbr sbs sbt sfa sfb sff sfi sfk sfo sfr sfs sft sia sib sif sii sik sio sir sis sit sk- ska skb skf ski skk sko skr sks skt soa sob sof soi sok soo sor sos sot sr- sra srb srf sri srk sro srr srs srt ss- ssa ssb ssf ssi ssk sso ssr sss sst sta stb stf sti stk sto str sts stt taa tab taf tai tak tao tar tas tat tba tbb tbf tbi tbk tbo tbr tbs tbt tfa tfb tff tfi tfk tfo tfr tfs tft tia tib tif tii tik tio tir tis tit tka tkb tkk tko tkr tks tkt to- toa tob tof toi tok too tor tos tot tra trb trf tri trk tro trr trs trt tsa tsb tsf tsi tsk tso tsr tss tst tta ttb ttf tti ttk tto ttr tts ttt