a-a a-b a-c aaa aab aac aad aah aao aar aau ab- aba abb abc abd abh abo abr abu ac- aca acb acc acd ach aco acr acu ad- ada adb adc add adh ado adr adu aha ahb ahc ahd ahh aho ahr ahu aoa aob aoc aod aoh aoo aor aou ar- ara arb arc ard arh aro arr aru au- aua aub auc aud auh auo aur b-u baa bab bac bad bah bao bar bau bba bbb bbc bbd bbh bbo bbr bbu bca bcb bcc bcd bch bco bcr bcu bda bdb bdc bdd bdh bdo bdr bdu bha bhb bhc bhd bhh bho bhr bhu boa bob boc bod boh boo bor bou bra brb brd brh bro brr bru bua bub buc bud buh buo bur buu c-- caa cab cac cad cah cao car cau cba cbb cbc cbd cbh cbo cbr cbu cca ccb ccc ccd cch cco ccr ccu cda cdb cdc cdd cdh cdo cdr cdu ch- cha chb chc chd chh cho chr chu co- coa cob coc cod coh coo cor cou cra crb crc crd crh cro crr cru cua cub cuc cud cuh cuo cur cuu daa dab dac dad dah dao dar dau dba dbb dbc dbd dbh dbo dbr dbu dca dcb dcc dcd dco dcr dcu dda ddb ddc ddd ddh ddo ddr ddu dh- dha dhb dhc dhd dhh dho dhr dhu doa dob doc dod doh doo dor dou dra drb drc drd dro drr dru dua dub duc dud duh duo dur haa hab hac had hah hao har hau hba hbb hbc hbd hbh hbo hbr hbu hca hcb hcc hcd hch hco hcr hda hdb hdc hdd hdh hdo hdr hdu hha hhb hhc hhd hhh hho hhr hhu hoa hob hoc hod hoh hoo hor hou hr- hra hrb hrc hrd hrh hro hrr hru hua hub huc hud huh huo hur huu oaa oab oac oad oah oao oar oau ob- oba obb obc obd obh obo obr obu oc- oca ocb occ ocd och oco ocr ocu oda odb odc odd odh odo odr odu oha ohc ohd ohh oho ohr ohu oo- ooa oob ooc ood ooh ooo oor or- ora orb orc ord orh oro orr oru ou- oua ouc oud ouh ouo our ra- raa rab rac rad rah rao rar rau rba rbb rbc rbd rbh rbo rbr rbu rca rcb rcc rcd rch rco rcr rcu rda rdb rdc rdd rdh rdo rdr rdu rh- rha rhb rhc rhd rhh rho rhr rhu roa rob roc rod roh roo ror rou rra rrb rrc rrd rrh rrr rru rua rub ruc rud ruh ruo rur ruu ua- uaa uab uac uad uah uao uar uau uba ubb ubc ubh ubo ubr ubu uca ucb ucc ucd uch uco ucr ucu uda udb udc udd udo udr udu uha uhb uhc uhd uhh uho uhr uhu uoa uob uoc uod uoo uor ur- ura urb urc urd uro urr uru uua uuc uur uuu