-er a-a a-b aaa aab aae aaf aan aar aas aau ab- aba abb abe abf abn abr abs abu aea aeb aee aef aen aer aes aeu af- afa afb afe aff afn afr afs afu an- ana anb ane anf ann anr ans anu ar- ara arb are arf arn arr ars aru as- asa asb ase asf asn asr ass asu au- aua aub aue auf aun aur aus b-u baa bab bae baf ban bar bas bau bba bbb bbe bbf bbn bbr bbs bbu be- bea beb bee bef ben ber bes beu bfa bfb bfe bff bfn bfr bfs bfu bna bnb bne bnf bnn bnr bns bnu bra brb bre brf brn brr brs bru bsa bsb bse bsf bsn bsr bss bsu bua bub bue buf bun bur bus buu eaa eab eae eaf ean ear eas eau eba ebb ebe ebf ebn ebr ebs ebu eea eeb eee eef een eer ees ef- efa efb efe eff efr efs en- ena enb ene enf enn enr ens enu era erb ere erf ern err ers eru es- esa esb ese esf esn esr ess esu eu- eua eub eue euf eun eur eus faa fab fae faf fan far fas fau fba fbb fbe fbf fbn fbr fbs fbu fea feb fee fef fen fer fes feu ffa ffe fff ffn ffr ffs ffu fna fnb fne fnf fnn fnr fns fnu fra frb fre frf frn frr frs fru fsa fsb fse fsf fsn fsr fss fsu fua fub fue fuf fun fur fus fuu naa nab nae naf nan nar nas nau nba nbb nbe nbf nbn nbr nbs nbu ne- nea neb nee nef nen ner nes neu nfa nfb nfe nff nfn nfr nfs nfu nna nnb nne nnf nnn nns nnu nra nrb nre nrf nrn nrr nrs nru nsa nsb nse nsf nsn nsr nss nsu nua nub nue nun nur nus nuu ra- raa rab rae raf ran rar ras rau rba rbb rbe rbf rbn rbr rbs rbu re- rea reb ree ref ren rer res reu rfa rfb rfe rff rfn rfr rfs rfu rna rnb rnn rnr rns rnu rra rrb rrf rrn rrr rrs rru rsa rsb rse rsf rsn rsr rss rsu rua rub rue ruf run rur rus ruu saa sab sae saf san sar sas sau sba sbb sbe sbf sbn sbr sbs sbu se- sea seb see sef sen ser ses seu sfa sfb sfe sff sfn sfr sfs sfu sna snb sne snf snn snr sns snu sr- sra srb sre srf srn srr srs ss- ssa ssb sse ssf ssn ssr sss ssu sua sub sue suf sun sur sus suu ua- uaa uab uae uaf uan uar uas uau uba ubb ube ubf ubn ubr ubs ubu uea ueb uee uef uen uer ues ufa ufe uff ufn ufr ufs ufu un- una unb une unf unn unr uns unu ur- ura urb ure urf urn urr urs uru usa usb use usf usn usr uss usu uua uue uun uur uus uuu