a-a a-b a-c a-t aaa aab aac aan aao aar aas aat ab- aba abb abc abn abo abr abs abt ac- aca acb acc acn aco acr acs act an- ana anb anc ann ano anr ans ant aoa aob aoc aon aoo aor aos aot ar- ara arb arc arn aro arr ars art as- asa asb asc asn aso asr ass ast at- ata atb atc atn ato atr ats att baa bab bac ban bao bar bas bat bba bbb bbc bbn bbo bbr bbs bbt bca bcb bcc bcn bco bcr bcs bct bna bnb bnc bnn bno bnr bns bnt boa bob boc bon boo bor bos bot bra brb brn bro brr brs brt bsa bsb bsc bsn bso bsr bss bst bta btb btc btn bto btr bts btt c-- caa cab cac can cao car cas cat cba cbb cbc cbn cbo cbr cbs cbt cca ccb ccc ccn cco ccr ccs cct cn- cna cnb cnc cnn cno cnr cns cnt co- coa cob coc con coo cor cos cot cra crb crc crn cro crr crs crt csa csb csc csn cso csr css cst cta ctb ctc ctn cto ctr cts ctt naa nab nac nan nao nar nas nat nba nbb nbc nbn nbo nbr nbs nbt nca ncb ncc ncn nco ncr ncs nct nna nnb nnc nnn nno nns nnt no- noa nob noc non noo nor nos not nra nrb nrc nrn nro nrr nrs nrt nsa nsb nsc nsn nso nsr nss nst nta ntb ntc ntn nto ntr nts ntt oaa oab oac oan oao oar oas oat ob- oba obb obc obn obo obr obs obt oc- oca ocb occ ocn oco ocr ocs oct on- ona onb onc onn ono onr ons ont oo- ooa oob ooc oon ooo oor oos oot or- ora orb orc orn oro orr ors ort os- osa osb osc osn oso osr oss ost ot- ota otb otc otn oto otr ots ott ra- raa rab rac ran rao rar ras rat rba rbb rbc rbn rbo rbr rbs rbt rca rcb rcc rcn rco rcr rcs rct rna rnb rnc rnn rno rnr rns rnt roa rob roc ron roo ror ros rot rra rrb rrc rrn rrr rrs rrt rsa rsb rsc rsn rso rsr rss rst rta rtb rtc rtn rto rtr rts rtt saa sab sac san sao sar sas sat sba sbb sbc sbn sbo sbr sbs sbt sca scb scc scn sco scr scs sct sna snb snc snn sno snr sns snt soa sob soc son soo sor sos sot sr- sra srb src srn sro srr srs srt ss- ssa ssb ssc ssn sso ssr sss sst sta stb stc stn sto str sts stt taa tab tac tan tao tar tas tat tba tbb tbc tbn tbo tbr tbs tbt tca tcb tcc tcn tco tcr tcs tct tna tnb tnc tnn tno tnr tns tnt to- toa tob toc ton too tor tos tot tra trb trc trn tro trr trs trt tsa tsb tsc tsn tso tsr tss tst tta ttb ttc ttn tto ttr tts ttt