-er a-a a-b aaa aab aae aah aak aan aao aar aau ab- aba abb abe abh abk abn abo abr abu aea aeb aee aeh aek aen aeo aer aeu aha ahb ahe ahh ahk ahn aho ahr ahu aka akb ake akh akk akn ako akr aku an- ana anb ane anh ank ann ano anr anu aoa aob aoe aoh aok aon aoo aor aou ar- ara arb are arh ark arn aro arr aru au- aua aub aue auh auk aun auo aur b-u baa bab bae bah bak ban bao bar bau bba bbb bbe bbh bbk bbn bbo bbr bbu be- bea beb bee beh bek ben beo ber beu bha bhb bhe bhh bhk bho bhr bhu bka bkb bke bkk bkn bko bkr bna bnb bne bnk bnn bno bnr bnu boa bob boe boh bok bon boo bor bou bra brb bre brh brk brn bro brr bru bua bub bue buh buk bun buo bur buu eaa eab eae eah eak ean eao ear eau eba ebb ebe ebh ebk ebn ebo ebr ebu eea eeb eee eek een eeo eer eha ehb ehe ehh ehn eho ehr ehu eka ekb eke ekh eko ekr eku en- ena enb ene enh enk enn eno enr enu eo- eoa eob eoe eoh eok eon eoo eor eou era erb ere erh erk ern ero err eru eu- eua eub eue eun eur haa hab hae hah hak han hao har hau hba hbb hbe hbh hbk hbn hbo hbr hbu he- hea heb hee heh hek hen heo her heu hha hhb hhe hhh hhk hhn hho hhr hhu hka hkb hkh hkk hkn hko hkr hku hna hnb hne hnh hnk hnn hno hnu hoa hob hoe hoh hok hon hoo hor hou hr- hra hrb hre hrh hrk hrn hro hrr hru hua hub hue huh huk hun huo hur huu ka- kaa kab kae kah kak kan kao kar kau kba kbb kbe kbh kbk kbn kbo kbr kbu ke- kea keb kee keh kek ken keo ker kha khe khh khk khn kho khr khu kkb kke kkh kkk kkn kkr kku kn- kna kne knk knn kno knr knu koa kob koe koh kok kon koo kor kou kra krk krn kro krr kru kub kue kuh kuk kun kur kuu naa nab nae nah nak nan nao nar nau nba nbb nbe nbk nbn nbo nbr nbu ne- nea neb nee neh nek nen neo ner neu nha nhb nhe nhh nhk nhn nhr nhu nka nke nkk nkn nko nkr nku nna nnb nne nnh nnk nnn nno nnu no- noa nob noe noh nok non noo nor nou nra nrb nre nrk nrn nro nrr nru nua nub nue nuh nuk nun nuo nur nuu oaa oab oae oah oak oan oao oar oau ob- oba obb obe obh obk obn obo obr obu oea oeb oee oeh oen oeo oer oha ohe ohh ohn oho ohr ohu oka okb oke okk oko okr oku on- ona onb one onh onk onn ono onr onu oo- ooa oob ooh ook oon ooo oor or- ora orb ore orh ork orn oro orr oru ou- oua oue ouh ouk oun ouo our ra- raa rab rae rah rak ran rao rar rau rba rbb rbe rbh rbk rbn rbo rbr rbu re- rea reb ree reh rek ren reo rer reu rh- rha rhb rhe rhh rhn rho rhr rhu rkb rke rkk rko rku rna rnb rnh rnn rno rnr rnu roa rob roe roh rok ron roo ror rou rra rrb rrh rrk rrn rrr rru rua rub rue ruh ruk run ruo rur ruu ua- uaa uab uae uah uak uan uao uar uau uba ubb ube ubh ubk ubn ubo ubr ubu uea ueb uee ueh uen uer uha uhb uhe uhh uho uhr uhu uka ukb uke ukk ukn ukr uku un- una unb une unh unk unn uno unr unu uoa uob uoe uok uon uoo uor ur- ura urb ure urk urn uro urr uru uua uue uun uur uuu