a-a a-b a-c aaa aab aac aad aah aar aau ab- aba abb abc abd abh abr abu ac- aca acb acc acd ach acr acu ad- ada adb adc add adh adr adu aha ahb ahc ahd ahh ahr ahu ar- ara arb arc ard arh arr aru au- aua aub auc aud auh aur b-u baa bab bac bad bah bar bau bba bbb bbc bbd bbh bbr bbu bca bcb bcc bcd bch bcr bcu bda bdb bdc bdd bdh bdr bdu bha bhb bhc bhd bhh bhr bhu bra brb brd brh brr bru bua bub buc bud buh bur buu c-- caa cab cac cad cah car cau cba cbb cbc cbd cbh cbr cbu cca ccb ccc ccd cch ccr ccu cda cdb cdc cdd cdh cdr cdu ch- cha chb chc chd chh chr chu cra crb crc crd crh crr cru cua cub cuc cud cuh cur cuu daa dab dac dad dah dar dau dba dbb dbc dbd dbh dbr dbu dca dcb dcc dcd dcr dcu dda ddb ddc ddd ddh ddr ddu dh- dha dhb dhc dhd dhh dhr dhu dra drb drc drd drr dru dua dub duc dud duh dur haa hab hac had hah har hau hba hbb hbc hbd hbh hbr hbu hca hcb hcc hcd hch hcr hda hdb hdc hdd hdh hdr hdu hha hhb hhc hhd hhh hhr hhu hr- hra hrb hrc hrd hrh hrr hru hua hub huc hud huh hur huu ra- raa rab rac rad rah rar rau rba rbb rbc rbd rbh rbr rbu rca rcb rcc rcd rch rcr rcu rda rdb rdc rdd rdh rdr rdu rh- rha rhb rhc rhd rhh rhr rhu rra rrb rrc rrd rrh rrr rru rua rub ruc rud ruh rur ruu ua- uaa uab uac uad uah uar uau uba ubb ubc ubh ubr ubu uca ucb ucc ucd uch ucr ucu uda udb udc udd udr udu uha uhb uhc uhd uhh uhr uhu ur- ura urb urc urd urr uru uua uuc uur uuu