a-a a-b a-c a-t aaa aab aac aad aan aao aar aat ab- aba abb abc abd abn abo abr abt ac- aca acb acc acd acn aco acr act ad- ada adb adc add adn ado adr adt an- ana anb anc and ann ano anr ant aoa aob aoc aod aon aoo aor aot ar- ara arb arc ard arn aro arr art at- ata atb atc atd atn ato atr att baa bab bac bad ban bao bar bat bba bbb bbc bbd bbn bbo bbr bbt bca bcb bcc bcd bcn bco bcr bct bda bdb bdc bdd bdo bdr bdt bna bnb bnc bnd bnn bno bnr bnt boa bob boc bod bon boo bor bot bra brb brd brn bro brr brt bta btb btc btd btn bto btr btt c-- caa cab cac cad can cao car cat cba cbb cbc cbd cbn cbo cbr cbt cca ccb ccc ccd ccn cco ccr cct cda cdb cdc cdd cdn cdo cdr cdt cn- cna cnb cnc cnd cnn cno cnr cnt co- coa cob coc cod con coo cor cot cra crb crc crd crn cro crr crt cta ctb ctc ctd ctn cto ctr ctt daa dab dac dad dan dao dar dat dba dbb dbc dbd dbn dbo dbr dbt dca dcb dcc dcd dcn dco dcr dct dda ddb ddc ddd ddn ddo ddr ddt dna dnb dnc dnd dnn dno dnr dnt doa dob doc dod don doo dor dot dra drb drc drd drn dro drr drt dta dtb dtc dtd dtn dto dtr dtt naa nab nac nad nan nao nar nat nba nbb nbc nbd nbn nbo nbr nbt nca ncb ncc ncd ncn nco ncr nct nda ndb ndc ndd ndn ndo ndr ndt nna nnb nnc nnn nno nnt no- noa nob noc nod non noo nor not nra nrb nrc nrd nrn nro nrr nrt nta ntb ntc ntd ntn nto ntr ntt oaa oab oac oad oan oao oar oat ob- oba obb obc obd obn obo obr obt oc- oca ocb occ ocd ocn oco ocr oct oda odb odc odd odn odo odr odt on- ona onb onc ond onn ono onr ont oo- ooa oob ooc ood oon ooo oor oot or- ora orb orc ord orn oro orr ort ot- ota otb otc otd otn oto otr ott ra- raa rab rac rad ran rao rar rat rba rbb rbc rbd rbn rbo rbr rbt rca rcb rcc rcd rcn rco rcr rct rda rdb rdc rdd rdn rdo rdr rdt rna rnb rnc rnd rnn rno rnr rnt roa rob roc rod ron roo ror rot rra rrb rrc rrd rrn rrr rrt rta rtb rtc rtd rtn rto rtr rtt taa tab tac tad tan tao tar tat tba tbb tbc tbd tbn tbo tbr tbt tca tcb tcc tcd tcn tco tcr tct tda tdb tdc tdd tdn tdo tdr tdt tna tnb tnc tnd tnn tno tnr tnt to- toa tob toc tod ton too tor tot tra trb trc trd trn tro trr trt tta ttb ttc ttd ttn tto ttr ttt