-th a-a a-b a-c a-t aaa aab aac aah aan aar aat ab- aba abb abc abh abn abr abt ac- aca acb acc ach acn acr act aha ahb ahc ahh ahn ahr aht an- ana anb anc anh ann anr ant ar- ara arb arc arh arn arr art at- ata atb atc ath atn atr att baa bab bac bah ban bar bat bba bbb bbc bbh bbn bbr bbt bca bcb bcc bch bcn bcr bct bha bhb bhc bhh bhr bht bna bnb bnc bnn bnr bnt bra brb brh brn brr brt bta btb btc bth btn btr btt c-- caa cab cac cah can car cat cba cbb cbc cbh cbn cbr cbt cca ccb ccc cch ccn ccr cct ch- cha chb chc chh chn chr cht cn- cna cnb cnc cnh cnn cnr cnt cra crb crc crh crn crr crt cta ctb ctc cth ctn ctr ctt haa hab hac hah han har hat hba hbb hbc hbh hbn hbr hbt hca hcb hcc hch hcn hcr hct hha hhb hhc hhh hhn hhr hht hna hnb hnc hnh hnn hnt hr- hra hrb hrc hrh hrn hrr hrt hta htb htc hth htn htr htt naa nab nac nah nan nar nat nba nbb nbc nbn nbr nbt nca ncb ncc nch ncn ncr nct nha nhb nhc nhh nhn nhr nht nna nnb nnc nnh nnn nnt nra nrb nrc nrn nrr nrt nta ntb ntc nth ntn ntr ntt ra- raa rab rac rah ran rar rat rba rbb rbc rbh rbn rbr rbt rca rcb rcc rch rcn rcr rct rh- rha rhb rhc rhh rhn rhr rht rna rnb rnc rnh rnn rnr rnt rra rrb rrc rrh rrn rrr rrt rta rtb rtc rtn rtr rtt taa tab tac tah tan tar tat tba tbb tbc tbh tbn tbr tbt tca tcb tcc tch tcn tcr tct th- tha thb thc thh thn thr tht tna tnb tnc tnh tnn tnr tnt tra trb trc trh trn trr trt tta ttb ttc tth ttn ttr ttt