-er a-a a-b aaa aab aae aah aak aan aao aar aas ab- aba abb abe abh abk abn abo abr abs aea aeb aee aeh aek aen aeo aer aes aha ahb ahe ahh ahk ahn aho ahr ahs aka akb ake akh akk akn ako akr aks an- ana anb ane anh ank ann ano anr ans aoa aob aoe aoh aok aon aoo aor aos ar- ara arb are arh ark arn aro arr ars as- asa asb ase ash ask asn aso asr ass baa bab bae bah bak ban bao bar bas bba bbb bbe bbh bbk bbn bbo bbr bbs be- bea beb bee beh bek ben beo ber bes bha bhb bhe bhh bhk bho bhr bhs bka bkb bke bkk bkn bko bkr bks bna bnb bne bnk bnn bno bnr bns boa bob boe boh bok bon boo bor bos bra brb bre brh brk brn bro brr brs bsa bsb bse bsh bsk bsn bso bsr bss eaa eab eae eah eak ean eao ear eas eba ebb ebe ebh ebk ebn ebo ebr ebs eea eeb eee eek een eeo eer ees eha ehb ehe ehh ehn eho ehr ehs eka ekb eke ekh eko ekr eks en- ena enb ene enh enk enn eno enr ens eo- eoa eob eoe eoh eok eon eoo eor eos era erb ere erh erk ern ero err ers es- esa esb ese esh esk esn eso esr ess haa hab hae hah hak han hao har has hba hbb hbe hbh hbk hbn hbo hbr hbs he- hea heb hee heh hek hen heo her hes hha hhb hhe hhh hhk hhn hho hhr hhs hka hkb hkh hkk hkn hko hkr hks hna hnb hne hnh hnk hnn hno hns hoa hob hoe hoh hok hon hoo hor hos hr- hra hrb hre hrh hrk hrn hro hrr hrs hsa hsb hse hsh hsk hsn hsr hss ka- kaa kab kae kah kak kan kao kar kas kba kbb kbe kbh kbk kbn kbo kbr kbs ke- kea keb kee keh kek ken keo ker kes kha khe khh khk khn kho khr khs kkb kke kkh kkk kkn kkr kks kn- kna kne knk knn kno knr koa kob koe koh kok kon koo kor kos kra krk krn kro krr krs ksa ksb kse ksh ksk ksn kso ksr kss naa nab nae nah nak nan nao nar nas nba nbb nbe nbk nbn nbo nbr nbs ne- nea neb nee neh nek nen neo ner nes nha nhb nhe nhh nhk nhn nhr nhs nka nke nkk nkn nko nkr nks nna nnb nne nnh nnk nnn nno nns no- noa nob noe noh nok non noo nor nos nra nrb nre nrk nrn nro nrr nrs nsa nsb nse nsh nsk nsn nso nsr nss oaa oab oae oah oak oan oao oar oas ob- oba obb obe obh obk obn obo obr obs oea oeb oee oeh oen oeo oer oes oha ohe ohh ohn oho ohr ohs oka okb oke okk oko okr oks on- ona onb one onh onk onn ono onr ons oo- ooa oob ooh ook oon ooo oor oos or- ora orb ore orh ork orn oro orr ors os- osa osb ose osh osk osn oso osr oss ra- raa rab rae rah rak ran rao rar ras rba rbb rbe rbh rbk rbn rbo rbr rbs re- rea reb ree reh rek ren reo rer res rh- rha rhb rhe rhh rhn rho rhr rhs rkb rke rkk rko rks rna rnb rnh rnn rno rnr rns roa rob roe roh rok ron roo ror ros rra rrb rrh rrk rrn rrr rrs rsa rsb rse rsh rsk rsn rso rsr rss saa sab sae sah sak san sao sar sas sba sbb sbe sbh sbk sbn sbo sbr sbs se- sea seb see seh sek sen seo ser ses sh- sha shb she shh shk shn sho shr shs sk- ska skb ske skh skk sko skr sks sna snb sne snk snn sno snr sns soa sob soe soh sok son soo sor sos sr- sra srb sre srh srk srn sro srr srs ss- ssa ssb sse ssh ssk ssn sso ssr sss