-er a-a a-b aaa aab aae aah aan aao aar aas ab- aba abb abe abh abn abo abr abs aea aeb aee aeh aen aeo aer aes aha ahb ahe ahh ahn aho ahr ahs an- ana anb ane anh ann ano anr ans aoa aob aoe aoh aon aoo aor aos ar- ara arb are arh arn aro arr ars as- asa asb ase ash asn aso asr ass baa bab bae bah ban bao bar bas bba bbb bbe bbh bbn bbo bbr bbs be- bea beb bee beh ben beo ber bes bha bhb bhe bhh bho bhr bhs bna bnb bne bnn bno bnr bns boa bob boe boh bon boo bor bos bra brb bre brh brn bro brr brs bsa bsb bse bsh bsn bso bsr bss eaa eab eae eah ean eao ear eas eba ebb ebe ebh ebn ebo ebr ebs eea eeb eee een eeo eer ees eha ehb ehe ehh ehn eho ehr ehs en- ena enb ene enh enn eno enr ens eo- eoa eob eoe eoh eon eoo eor eos era erb ere erh ern ero err ers es- esa esb ese esh esn eso esr ess haa hab hae hah han hao har has hba hbb hbe hbh hbn hbo hbr hbs he- hea heb hee heh hen heo her hes hha hhb hhe hhh hhn hho hhr hhs hna hnb hne hnh hnn hno hns hoa hob hoe hoh hon hoo hor hos hr- hra hrb hre hrh hrn hro hrr hrs hsa hsb hse hsh hsn hsr hss naa nab nae nah nan nao nar nas nba nbb nbe nbn nbo nbr nbs ne- nea neb nee neh nen neo ner nes nha nhb nhe nhh nhn nhr nhs nna nnb nne nnh nnn nno nns no- noa nob noe noh non noo nor nos nra nrb nre nrn nro nrr nrs nsa nsb nse nsh nsn nso nsr nss oaa oab oae oah oan oao oar oas ob- oba obb obe obh obn obo obr obs oea oeb oee oeh oen oeo oer oes oha ohe ohh ohn oho ohr ohs on- ona onb one onh onn ono onr ons oo- ooa oob ooh oon ooo oor oos or- ora orb ore orh orn oro orr ors os- osa osb ose osh osn oso osr oss ra- raa rab rae rah ran rao rar ras rba rbb rbe rbh rbn rbo rbr rbs re- rea reb ree reh ren reo rer res rh- rha rhb rhe rhh rhn rho rhr rhs rna rnb rnh rnn rno rnr rns roa rob roe roh ron roo ror ros rra rrb rrh rrn rrr rrs rsa rsb rse rsh rsn rso rsr rss saa sab sae sah san sao sar sas sba sbb sbe sbh sbn sbo sbr sbs se- sea seb see seh sen seo ser ses sh- sha shb she shh shn sho shr shs sna snb sne snn sno snr sns soa sob soe soh son soo sor sos sr- sra srb sre srh srn sro srr srs ss- ssa ssb sse ssh ssn sso ssr sss