-er a-a a-b a-q aaa aab aae aan aao aaq aar aau ab- aba abb abe abn abo abq abr abu aea aeb aee aen aeo aeq aer aeu an- ana anb ane ann ano anq anr anu aoa aob aoe aon aoo aor aou aqa aqn aqo aqr ar- ara arb are arn aro arq arr aru au- aua aub aue aun auo aur b-u baa bab bae ban bao baq bar bau bba bbb bbe bbn bbo bbq bbr bbu be- bea beb bee ben beo beq ber beu bna bnb bne bnn bno bnr bnu boa bob boe bon boo boq bor bou bqe bra brb bre brn bro brq brr bru bua bub bue bun buo bur buu eaa eab eae ean eao ear eau eba ebb ebe ebn ebo ebq ebr ebu eea eeb eee een eeo eer en- ena enb ene enn eno enr enu eo- eoa eob eoe eon eoo eoq eor eou eqa eqe eqn eqq equ era erb ere ern ero erq err eru eu- eua eub eue eun eur naa nab nae nan nao nar nau nba nbb nbe nbn nbo nbr nbu ne- nea neb nee nen neo ner neu nna nnb nne nnn nno nnu no- noa nob noe non noo nor nou nra nrb nre nrn nro nrr nru nua nub nue nun nuo nuq nur nuu oaa oab oae oan oao oaq oar oau ob- oba obb obe obn obo obr obu oea oeb oee oen oeo oer on- ona onb one onn ono onr onu oo- ooa oob oon ooo oor oqb oqo or- ora orb ore orn oro orr oru ou- oua oue oun ouo our qaa qan qar qau qba qbe qbq qee qen qeo qnb qne qoo qor qqq qqu qra qrb qre qru qu- qua que quo qur ra- raa rab rae ran rao raq rar rau rba rbb rbe rbn rbo rbr rbu re- rea reb ree ren reo req rer reu rna rnb rnn rno rnr rnu roa rob roe ron roo ror rou rqn rra rrb rrn rrq rrr rru rua rub rue run ruo rur ruu ua- uaa uab uae uan uao uaq uar uau uba ubb ube ubn ubo ubr ubu uea ueb uee uen uer un- una unb une unn uno unq unr unu uoa uob uoe uon uoo uor ur- ura urb ure urn uro urr uru uua uue uun uur uuu