a-a a-b aaa aab aae aah aak aan aao aas ab- aba abb abe abh abk abn abo abs aea aeb aee aeh aek aen aeo aes aha ahb ahe ahh ahk ahn aho ahs aka akb ake akh akk akn ako aks an- ana anb ane anh ank ann ano ans aoa aob aoe aoh aok aon aoo aos as- asa asb ase ash ask asn aso ass baa bab bae bah bak ban bao bas bba bbb bbe bbh bbk bbn bbo bbs be- bea beb bee beh bek ben beo bes bha bhb bhe bhh bhk bho bhs bka bkb bke bkk bkn bko bks bna bnb bne bnk bnn bno bns boa bob boe boh bok bon boo bos bsa bsb bse bsh bsk bsn bso bss eaa eab eae eah eak ean eao eas eba ebb ebe ebh ebk ebn ebo ebs eea eeb eee eek een eeo ees eha ehb ehe ehh ehn eho ehs eka ekb eke ekh eko eks en- ena enb ene enh enk enn eno ens eo- eoa eob eoe eoh eok eon eoo eos es- esa esb ese esh esk esn eso ess haa hab hae hah hak han hao has hba hbb hbe hbh hbk hbn hbo hbs he- hea heb hee heh hek hen heo hes hha hhb hhe hhh hhk hhn hho hhs hka hkb hkh hkk hkn hko hks hna hnb hne hnh hnk hnn hno hns hoa hob hoe hoh hok hon hoo hos hsa hsb hse hsh hsk hsn hss ka- kaa kab kae kah kak kan kao kas kba kbb kbe kbh kbk kbn kbo kbs ke- kea keb kee keh kek ken keo kes kha khe khh khk khn kho khs kkb kke kkh kkk kkn kks kn- kna kne knk knn kno koa kob koe koh kok kon koo kos ksa ksb kse ksh ksk ksn kso kss naa nab nae nah nak nan nao nas nba nbb nbe nbk nbn nbo nbs ne- nea neb nee neh nek nen neo nes nha nhb nhe nhh nhk nhn nhs nka nke nkk nkn nko nks nna nnb nne nnh nnk nnn nno nns no- noa nob noe noh nok non noo nos nsa nsb nse nsh nsk nsn nso nss oaa oab oae oah oak oan oao oas ob- oba obb obe obh obk obn obo obs oea oeb oee oeh oen oeo oes oha ohe ohh ohn oho ohs oka okb oke okk oko oks on- ona onb one onh onk onn ono ons oo- ooa oob ooh ook oon ooo oos os- osa osb ose osh osk osn oso oss saa sab sae sah sak san sao sas sba sbb sbe sbh sbk sbn sbo sbs se- sea seb see seh sek sen seo ses sh- sha shb she shh shk shn sho shs sk- ska skb ske skh skk sko sks sna snb sne snk snn sno sns soa sob soe soh sok son soo sos ss- ssa ssb sse ssh ssk ssn sso sss