a-a a-b aaa aab aad aah aao aar aau ab- aba abb abd abh abo abr abu ad- ada adb add adh ado adr adu aha ahb ahd ahh aho ahr ahu aoa aob aod aoh aoo aor aou ar- ara arb ard arh aro arr aru au- aua aub aud auh auo aur b-u baa bab bad bah bao bar bau bba bbb bbd bbh bbo bbr bbu bda bdb bdd bdh bdo bdr bdu bha bhb bhd bhh bho bhr bhu boa bob bod boh boo bor bou bra brb brd brh bro brr bru bua bub bud buh buo bur buu daa dab dad dah dao dar dau dba dbb dbd dbh dbo dbr dbu dda ddb ddd ddh ddo ddr ddu dh- dha dhb dhd dhh dho dhr dhu doa dob dod doh doo dor dou dra drb drd dro drr dru dua dub dud duh duo dur haa hab had hah hao har hau hba hbb hbd hbh hbo hbr hbu hda hdb hdd hdh hdo hdr hdu hha hhb hhd hhh hho hhr hhu hoa hob hod hoh hoo hor hou hr- hra hrb hrd hrh hro hrr hru hua hub hud huh huo hur huu oaa oab oad oah oao oar oau ob- oba obb obd obh obo obr obu oda odb odd odh odo odr odu oha ohd ohh oho ohr ohu oo- ooa oob ood ooh ooo oor or- ora orb ord orh oro orr oru ou- oua oud ouh ouo our ra- raa rab rad rah rao rar rau rba rbb rbd rbh rbo rbr rbu rda rdb rdd rdh rdo rdr rdu rh- rha rhb rhd rhh rho rhr rhu roa rob rod roh roo ror rou rra rrb rrd rrh rrr rru rua rub rud ruh ruo rur ruu ua- uaa uab uad uah uao uar uau uba ubb ubh ubo ubr ubu uda udb udd udo udr udu uha uhb uhd uhh uho uhr uhu uoa uob uod uoo uor ur- ura urb urd uro urr uru uua uur uuu