a-a a-b a-c a-t aaa aab aac aad aao aar aas aat ab- aba abb abc abd abo abr abs abt ac- aca acb acc acd aco acr acs act ad- ada adb adc add ado adr ads adt aoa aob aoc aod aoo aor aos aot ar- ara arb arc ard aro arr ars art as- asa asb asc asd aso asr ass ast at- ata atb atc atd ato atr ats att baa bab bac bad bao bar bas bat bba bbb bbc bbd bbo bbr bbs bbt bca bcb bcc bcd bco bcr bcs bct bda bdb bdc bdd bdo bdr bds bdt boa bob boc bod boo bor bos bot bra brb brd bro brr brs brt bsa bsb bsc bsd bso bsr bss bst bta btb btc btd bto btr bts btt c-- caa cab cac cad cao car cas cat cba cbb cbc cbd cbo cbr cbs cbt cca ccb ccc ccd cco ccr ccs cct cda cdb cdc cdd cdo cdr cds cdt co- coa cob coc cod coo cor cos cot cra crb crc crd cro crr crs crt csa csb csc csd cso csr css cst cta ctb ctc ctd cto ctr cts ctt daa dab dac dad dao dar das dat dba dbb dbc dbd dbo dbr dbs dbt dca dcb dcc dcd dco dcr dcs dct dda ddb ddc ddd ddo ddr dds ddt doa dob doc dod doo dor dos dot dra drb drc drd dro drr drs drt dsa dsb dsc dsd dso dsr dss dst dta dtb dtc dtd dto dtr dts dtt oaa oab oac oad oao oar oas oat ob- oba obb obc obd obo obr obs obt oc- oca ocb occ ocd oco ocr ocs oct oda odb odc odd odo odr ods odt oo- ooa oob ooc ood ooo oor oos oot or- ora orb orc ord oro orr ors ort os- osa osb osc osd oso osr oss ost ot- ota otb otc otd oto otr ots ott ra- raa rab rac rad rao rar ras rat rba rbb rbc rbd rbo rbr rbs rbt rca rcb rcc rcd rco rcr rcs rct rda rdb rdc rdd rdo rdr rds rdt roa rob roc rod roo ror ros rot rra rrb rrc rrd rrr rrs rrt rsa rsb rsc rsd rso rsr rss rst rta rtb rtc rtd rto rtr rts rtt saa sab sac sad sao sar sas sat sba sbb sbc sbd sbo sbr sbs sbt sca scb scc scd sco scr scs sct sda sdb sdc sdd sdo sdr sds sdt soa sob soc sod soo sor sos sot sr- sra srb src srd sro srr srs srt ss- ssa ssb ssc ssd sso ssr sss sst sta stb stc std sto str sts stt taa tab tac tad tao tar tas tat tba tbb tbc tbd tbo tbr tbs tbt tca tcb tcc tcd tco tcr tcs tct tda tdb tdc tdd tdo tdr tds tdt to- toa tob toc tod too tor tos tot tra trb trc trd tro trr trs trt tsa tsb tsc tsd tso tsr tss tst tta ttb ttc ttd tto ttr tts ttt