a-a a-b a-c aaa aab aac aad aah aan aar ab- aba abb abc abd abh abn abr ac- aca acb acc acd ach acn acr ad- ada adb adc add adh adn adr aha ahb ahc ahd ahh ahn ahr an- ana anb anc and anh ann anr ar- ara arb arc ard arh arn arr baa bab bac bad bah ban bar bba bbb bbc bbd bbh bbn bbr bca bcb bcc bcd bch bcn bcr bda bdb bdc bdd bdh bdr bha bhb bhc bhd bhh bhr bna bnb bnc bnd bnn bnr bra brb brd brh brn brr c-- caa cab cac cad cah can car cba cbb cbc cbd cbh cbn cbr cca ccb ccc ccd cch ccn ccr cda cdb cdc cdd cdh cdn cdr ch- cha chb chc chd chh chn chr cn- cna cnb cnc cnd cnh cnn cnr cra crb crc crd crh crn crr daa dab dac dad dah dan dar dba dbb dbc dbd dbh dbn dbr dca dcb dcc dcd dcn dcr dda ddb ddc ddd ddh ddn ddr dh- dha dhb dhc dhd dhh dhr dna dnb dnc dnd dnh dnn dnr dra drb drc drd drn drr haa hab hac had hah han har hba hbb hbc hbd hbh hbn hbr hca hcb hcc hcd hch hcn hcr hda hdb hdc hdd hdh hdn hdr hha hhb hhc hhd hhh hhn hhr hna hnb hnc hnd hnh hnn hr- hra hrb hrc hrd hrh hrn hrr naa nab nac nad nah nan nar nba nbb nbc nbd nbn nbr nca ncb ncc ncd nch ncn ncr nda ndb ndc ndd ndh ndn ndr nha nhb nhc nhd nhh nhn nhr nna nnb nnc nnh nnn nra nrb nrc nrd nrn nrr ra- raa rab rac rad rah ran rar rba rbb rbc rbd rbh rbn rbr rca rcb rcc rcd rch rcn rcr rda rdb rdc rdd rdh rdn rdr rh- rha rhb rhc rhd rhh rhn rhr rna rnb rnc rnd rnh rnn rnr rra rrb rrc rrd rrh rrn rrr