-th a-a a-b a-c a-t aaa aab aac aah aan aao aar aat ab- aba abb abc abh abn abo abr abt ac- aca acb acc ach acn aco acr act aha ahb ahc ahh ahn aho ahr aht an- ana anb anc anh ann ano anr ant aoa aob aoc aoh aon aoo aor aot ar- ara arb arc arh arn aro arr art at- ata atb atc ath atn ato atr att baa bab bac bah ban bao bar bat bba bbb bbc bbh bbn bbo bbr bbt bca bcb bcc bch bcn bco bcr bct bha bhb bhc bhh bho bhr bht bna bnb bnc bnn bno bnr bnt boa bob boc boh bon boo bor bot bra brb brh brn bro brr brt bta btb btc bth btn bto btr btt c-- caa cab cac cah can cao car cat cba cbb cbc cbh cbn cbo cbr cbt cca ccb ccc cch ccn cco ccr cct ch- cha chb chc chh chn cho chr cht cn- cna cnb cnc cnh cnn cno cnr cnt co- coa cob coc coh con coo cor cot cra crb crc crh crn cro crr crt cta ctb ctc cth ctn cto ctr ctt haa hab hac hah han hao har hat hba hbb hbc hbh hbn hbo hbr hbt hca hcb hcc hch hcn hco hcr hct hha hhb hhc hhh hhn hho hhr hht hna hnb hnc hnh hnn hno hnt hoa hob hoc hoh hon hoo hor hot hr- hra hrb hrc hrh hrn hro hrr hrt hta htb htc hth htn hto htr htt naa nab nac nah nan nao nar nat nba nbb nbc nbn nbo nbr nbt nca ncb ncc nch ncn nco ncr nct nha nhb nhc nhh nhn nhr nht nna nnb nnc nnh nnn nno nnt no- noa nob noc noh non noo nor not nra nrb nrc nrn nro nrr nrt nta ntb ntc nth ntn nto ntr ntt oaa oab oac oah oan oao oar oat ob- oba obb obc obh obn obo obr obt oc- oca ocb occ och ocn oco ocr oct oha ohc ohh ohn oho ohr oht on- ona onb onc onh onn ono onr ont oo- ooa oob ooc ooh oon ooo oor oot or- ora orb orc orh orn oro orr ort ot- ota otb otc oth otn oto otr ott ra- raa rab rac rah ran rao rar rat rba rbb rbc rbh rbn rbo rbr rbt rca rcb rcc rch rcn rco rcr rct rh- rha rhb rhc rhh rhn rho rhr rht rna rnb rnc rnh rnn rno rnr rnt roa rob roc roh ron roo ror rot rra rrb rrc rrh rrn rrr rrt rta rtb rtc rtn rto rtr rtt taa tab tac tah tan tao tar tat tba tbb tbc tbh tbn tbo tbr tbt tca tcb tcc tch tcn tco tcr tct th- tha thb thc thh thn tho thr tht tna tnb tnc tnh tnn tno tnr tnt to- toa tob toc toh ton too tor tot tra trb trc trh trn tro trr trt tta ttb ttc tth ttn tto ttr ttt