a-a a-b a-t aaa aab aad aak aan aao aar aas aat ab- aba abb abd abk abn abo abr abs abt ad- ada adb add adk adn ado adr ads adt aka akb akd akk akn ako akr aks an- ana anb and ank ann ano anr ans ant aoa aob aod aok aon aoo aor aos aot ar- ara arb ard ark arn aro arr ars art as- asa asb asd ask asn aso asr ass ast at- ata atb atd atn ato atr ats att baa bab bad bak ban bao bar bas bat bba bbb bbd bbk bbn bbo bbr bbs bbt bda bdb bdd bdk bdo bdr bds bdt bka bkb bkk bkn bko bkr bks bkt bna bnb bnd bnk bnn bno bnr bns bnt boa bob bod bok bon boo bor bos bot bra brb brd brk brn bro brr brs brt bsa bsb bsd bsk bsn bso bsr bss bst bta btb btd btk btn bto btr bts btt daa dab dad dak dan dao dar das dat dba dbb dbd dbk dbn dbo dbr dbs dbt dda ddb ddd ddk ddn ddo ddr dds ddt dka dkb dkk dko dkr dks dkt dna dnb dnd dnk dnn dno dnr dns dnt doa dob dod dok don doo dor dos dot dra drb drd drk drn dro drr drs drt dsa dsb dsd dsk dsn dso dsr dss dst dta dtb dtd dtk dtn dto dtr dts dtt k-t ka- kaa kab kad kak kan kao kar kas kat kba kbb kbd kbk kbn kbo kbr kbs kda kdb kdk kdo kdr kds kdt kkb kkk kkn kkr kks kkt kn- kna knd knk knn kno knr knt koa kob kod kok kon koo kor kos kot kra krd krk krn kro krr krs krt ksa ksb ksd ksk ksn kso ksr kss kst kta ktb ktk ktn kto ktr kts ktt naa nab nad nak nan nao nar nas nat nba nbb nbd nbk nbn nbo nbr nbs nbt nda ndb ndd ndk ndn ndo ndr nds ndt nka nkk nkn nko nkr nks nkt nna nnb nnk nnn nno nns nnt no- noa nob nod nok non noo nor nos not nra nrb nrd nrk nrn nro nrr nrs nrt nsa nsb nsd nsk nsn nso nsr nss nst nta ntb ntd ntk ntn nto ntr nts ntt oaa oab oad oak oan oao oar oas oat ob- oba obb obd obk obn obo obr obs obt oda odb odd odn odo odr ods odt oka okb okd okk oko okr oks on- ona onb ond onk onn ono onr ons ont oo- ooa oob ood ook oon ooo oor oos oot or- ora orb ord ork orn oro orr ors ort os- osa osb osd osk osn oso osr oss ost ot- ota otb otd otk otn oto otr ots ott ra- raa rab rad rak ran rao rar ras rat rba rbb rbd rbk rbn rbo rbr rbs rbt rda rdb rdd rdn rdo rdr rds rdt rkb rkk rko rks rkt rna rnb rnd rnn rno rnr rns rnt roa rob rod rok ron roo ror ros rot rra rrb rrd rrk rrn rrr rrs rrt rsa rsb rsd rsk rsn rso rsr rss rst rta rtb rtd rtk rtn rto rtr rts rtt saa sab sad sak san sao sar sas sat sba sbb sbd sbk sbn sbo sbr sbs sbt sda sdb sdd sdk sdn sdo sdr sds sdt sk- ska skb skd skk sko skr sks skt sna snb snd snk snn sno snr sns snt soa sob sod sok son soo sor sos sot sr- sra srb srd srk srn sro srr srs srt ss- ssa ssb ssd ssk ssn sso ssr sss sst sta stb std stk stn sto str sts stt taa tab tad tak tan tao tar tas tat tba tbb tbd tbk tbn tbo tbr tbs tbt tda tdb tdd tdk tdn tdo tdr tds tdt tka tkb tkk tko tkr tks tkt tna tnb tnd tnk tnn tno tnr tns tnt to- toa tob tod tok ton too tor tos tot tra trb trd trk trn tro trr trs trt tsa tsb tsd tsk tsn tso tsr tss tst tta ttb ttd ttk ttn tto ttr tts ttt