a-a a-b a-c aaa aab aac aad aah aan aar aau ab- aba abb abc abd abh abn abr abu ac- aca acb acc acd ach acn acr acu ad- ada adb adc add adh adn adr adu aha ahb ahc ahd ahh ahn ahr ahu an- ana anb anc and anh ann anr anu ar- ara arb arc ard arh arn arr aru au- aua aub auc aud auh aun aur b-u baa bab bac bad bah ban bar bau bba bbb bbc bbd bbh bbn bbr bbu bca bcb bcc bcd bch bcn bcr bcu bda bdb bdc bdd bdh bdr bdu bha bhb bhc bhd bhh bhr bhu bna bnb bnc bnd bnn bnr bnu bra brb brd brh brn brr bru bua bub buc bud buh bun bur buu c-- caa cab cac cad cah can car cau cba cbb cbc cbd cbh cbn cbr cbu cca ccb ccc ccd cch ccn ccr ccu cda cdb cdc cdd cdh cdn cdr cdu ch- cha chb chc chd chh chn chr chu cn- cna cnb cnc cnd cnh cnn cnr cnu cra crb crc crd crh crn crr cru cua cub cuc cud cuh cun cur cuu daa dab dac dad dah dan dar dau dba dbb dbc dbd dbh dbn dbr dbu dca dcb dcc dcd dcn dcr dcu dda ddb ddc ddd ddh ddn ddr ddu dh- dha dhb dhc dhd dhh dhr dhu dna dnb dnc dnd dnh dnn dnr dra drb drc drd drn drr dru dua dub duc dud duh dun dur haa hab hac had hah han har hau hba hbb hbc hbd hbh hbn hbr hbu hca hcb hcc hcd hch hcn hcr hda hdb hdc hdd hdh hdn hdr hdu hha hhb hhc hhd hhh hhn hhr hhu hna hnb hnc hnd hnh hnn hnu hr- hra hrb hrc hrd hrh hrn hrr hru hua hub huc hud huh hun hur huu naa nab nac nad nah nan nar nau nba nbb nbc nbd nbn nbr nbu nca ncb ncc ncd nch ncn ncr ncu nda ndb ndc ndd ndh ndn ndr ndu nha nhb nhc nhd nhh nhn nhr nhu nna nnb nnc nnh nnn nnu nra nrb nrc nrd nrn nrr nru nua nub nuc nud nuh nun nur nuu ra- raa rab rac rad rah ran rar rau rba rbb rbc rbd rbh rbn rbr rbu rca rcb rcc rcd rch rcn rcr rcu rda rdb rdc rdd rdh rdn rdr rdu rh- rha rhb rhc rhd rhh rhn rhr rhu rna rnb rnc rnd rnh rnn rnr rnu rra rrb rrc rrd rrh rrn rrr rru rua rub ruc rud ruh run rur ruu ua- uaa uab uac uad uah uan uar uau uba ubb ubc ubh ubn ubr ubu uca ucb ucc ucd uch ucn ucr ucu uda udb udc udd udn udr udu uha uhb uhc uhd uhh uhr uhu un- una unb unc und unh unn unr unu ur- ura urb urc urd urn urr uru uua uuc uun uur uuu