a-a a-b a-i a-t aaa aab aai aak aar aas aat ab- aba abb abi abk abr abs abt ai- aia aib aii aik air ais ait aka akb aki akk akr aks ar- ara arb ari ark arr ars art as- asa asb asi ask asr ass ast at- ata atb ati atr ats att baa bab bai bak bar bas bat bba bbb bbi bbk bbr bbs bbt bi- bia bib bii bik bir bis bit bka bkb bkk bkr bks bkt bra brb bri brk brr brs brt bsa bsb bsi bsk bsr bss bst bta btb bti btk btr bts btt ia- iaa iab iai iar ias iat iba ibb ibi ibk ibr ibs ibt iia iib iii iir iis iit ika ikb iki ikk ikr iks ikt ir- ira irb iri irk irr irs irt is- isa isb isi isk isr iss ist ita itb iti itk its itt k-t ka- kaa kab kai kak kar kas kat kba kbb kbi kbk kbr kbs kia kib kii kik kir kis kit kkb kki kkk kkr kks kkt kra kri krk krr krs krt ksa ksb ksi ksk ksr kss kst kta ktb ktk ktr kts ktt ra- raa rab rai rak rar ras rat rba rbb rbi rbk rbr rbs rbt ria rib rii rik rir ris rit rkb rkk rks rkt rra rrb rri rrk rrr rrs rrt rsa rsb rsi rsk rsr rss rst rta rtb rti rtk rtr rts rtt saa sab sai sak sar sas sat sba sbb sbi sbk sbr sbs sbt sia sib sii sik sir sis sit sk- ska skb ski skk skr sks skt sr- sra srb sri srk srr srs srt ss- ssa ssb ssi ssk ssr sss sst sta stb sti stk str sts stt taa tab tai tak tar tas tat tba tbb tbi tbk tbr tbs tbt tia tib tii tik tir tis tit tka tkb tkk tkr tks tkt tra trb tri trk trr trs trt tsa tsb tsi tsk tsr tss tst tta ttb tti ttk ttr tts ttt