-er a-a a-b a-z aaa aab aae aah aao aar aau aaz ab- aba abb abe abh abo abr abu abz aea aeb aee aeh aeo aer aeu aez aha ahb ahe ahh aho ahr ahu ahz aoa aob aoe aoh aoo aor aou ar- ara arb are arh aro arr aru arz au- aua aub aue auh auo aur auz az- aza azb aze azo azu azz b-u baa bab bae bah bao bar bau baz bba bbb bbe bbh bbo bbr bbu be- bea beb bee beh beo ber beu bez bha bhb bhe bhh bho bhr bhu boa bob boe boh boo bor bou boz bra brb bre brh bro brr bru brz bua bub bue buh buo bur buu buz bza bze bzh bzo bzr bzu bzz eaa eab eae eah eao ear eau eaz eba ebb ebe ebh ebo ebr ebu eea eeb eee eeo eer eha ehb ehe ehh eho ehr ehu eo- eoa eob eoe eoh eoo eor eou era erb ere erh ero err eru erz eu- eua eub eue eur eze ezh ezo ezr ezz haa hab hae hah hao har hau haz hba hbb hbe hbh hbo hbr hbu hbz he- hea heb hee heh heo her heu hez hha hhb hhe hhh hho hhr hhu hhz hoa hob hoe hoh hoo hor hou hr- hra hrb hre hrh hro hrr hru hrz hua hub hue huh huo hur huu huz hze hzo oaa oab oae oah oao oar oau ob- oba obb obe obh obo obr obu oea oeb oee oeh oeo oer oha ohe ohh oho ohr ohu oo- ooa oob ooh ooo oor or- ora orb ore orh oro orr oru orz ou- oua oue ouh ouo our oza oze ozo ozu ozz ra- raa rab rae rah rao rar rau raz rba rbb rbe rbh rbo rbr rbu re- rea reb ree reh reo rer reu rez rh- rha rhb rhe rhh rho rhr rhu roa rob roe roh roo ror rou roz rra rrb rrh rrr rru rua rub rue ruh ruo rur ruu ruz rza rzb rze rzo ua- uaa uab uae uah uao uar uau uaz uba ubb ube ubh ubo ubr ubu uea ueb uee ueh uer uha uhb uhe uhh uho uhr uhu uoa uob uoe uoo uor ur- ura urb ure uro urr uru urz uua uue uur uuu uza uzb uzh uzo uzu zaa zab zah zao zar zaz zbb zbr zea zeb zee zeh zeo zer zez zha zhe zho zhr zhu zo- zoa zob zoe zoo zor zou zrh zro zub zur zuz zzr zzz