a-a a-b a-t aaa aab aad aak aar aas aat ab- aba abb abd abk abr abs abt ad- ada adb add adk adr ads adt aka akb akd akk akr aks ar- ara arb ard ark arr ars art as- asa asb asd ask asr ass ast at- ata atb atd atr ats att baa bab bad bak bar bas bat bba bbb bbd bbk bbr bbs bbt bda bdb bdd bdk bdr bds bdt bka bkb bkk bkr bks bkt bra brb brd brk brr brs brt bsa bsb bsd bsk bsr bss bst bta btb btd btk btr bts btt daa dab dad dak dar das dat dba dbb dbd dbk dbr dbs dbt dda ddb ddd ddk ddr dds ddt dka dkb dkk dkr dks dkt dra drb drd drk drr drs drt dsa dsb dsd dsk dsr dss dst dta dtb dtd dtk dtr dts dtt k-t ka- kaa kab kad kak kar kas kat kba kbb kbd kbk kbr kbs kda kdb kdk kdr kds kdt kkb kkk kkr kks kkt kra krd krk krr krs krt ksa ksb ksd ksk ksr kss kst kta ktb ktk ktr kts ktt ra- raa rab rad rak rar ras rat rba rbb rbd rbk rbr rbs rbt rda rdb rdd rdr rds rdt rkb rkk rks rkt rra rrb rrd rrk rrr rrs rrt rsa rsb rsd rsk rsr rss rst rta rtb rtd rtk rtr rts rtt saa sab sad sak sar sas sat sba sbb sbd sbk sbr sbs sbt sda sdb sdd sdk sdr sds sdt sk- ska skb skd skk skr sks skt sr- sra srb srd srk srr srs srt ss- ssa ssb ssd ssk ssr sss sst sta stb std stk str sts stt taa tab tad tak tar tas tat tba tbb tbd tbk tbr tbs tbt tda tdb tdd tdk tdr tds tdt tka tkb tkk tkr tks tkt tra trb trd trk trr trs trt tsa tsb tsd tsk tsr tss tst tta ttb ttd ttk ttr tts ttt