-er a-a a-b a-q aaa aab aae aan aao aaq aar ab- aba abb abe abn abo abq abr aea aeb aee aen aeo aeq aer an- ana anb ane ann ano anq anr aoa aob aoe aon aoo aor aqa aqn aqo aqr ar- ara arb are arn aro arq arr baa bab bae ban bao baq bar bba bbb bbe bbn bbo bbq bbr be- bea beb bee ben beo beq ber bna bnb bne bnn bno bnr boa bob boe bon boo boq bor bqe bra brb bre brn bro brq brr eaa eab eae ean eao ear eba ebb ebe ebn ebo ebq ebr eea eeb eee een eeo eer en- ena enb ene enn eno enr eo- eoa eob eoe eon eoo eoq eor eqa eqe eqn eqq era erb ere ern ero erq err naa nab nae nan nao nar nba nbb nbe nbn nbo nbr ne- nea neb nee nen neo ner nna nnb nne nnn nno no- noa nob noe non noo nor nra nrb nre nrn nro nrr oaa oab oae oan oao oaq oar ob- oba obb obe obn obo obr oea oeb oee oen oeo oer on- ona onb one onn ono onr oo- ooa oob oon ooo oor oqb oqo or- ora orb ore orn oro orr qaa qan qar qba qbe qbq qee qen qeo qnb qne qoo qor qqq qra qrb qre ra- raa rab rae ran rao raq rar rba rbb rbe rbn rbo rbr re- rea reb ree ren reo req rer rna rnb rnn rno rnr roa rob roe ron roo ror rqn rra rrb rrn rrq rrr