a-a a-b aaa aab aah aak aan aao aas ab- aba abb abh abk abn abo abs aha ahb ahh ahk ahn aho ahs aka akb akh akk akn ako aks an- ana anb anh ank ann ano ans aoa aob aoh aok aon aoo aos as- asa asb ash ask asn aso ass baa bab bah bak ban bao bas bba bbb bbh bbk bbn bbo bbs bha bhb bhh bhk bho bhs bka bkb bkk bkn bko bks bna bnb bnk bnn bno bns boa bob boh bok bon boo bos bsa bsb bsh bsk bsn bso bss haa hab hah hak han hao has hba hbb hbh hbk hbn hbo hbs hha hhb hhh hhk hhn hho hhs hka hkb hkh hkk hkn hko hks hna hnb hnh hnk hnn hno hns hoa hob hoh hok hon hoo hos hsa hsb hsh hsk hsn hss ka- kaa kab kah kak kan kao kas kba kbb kbh kbk kbn kbo kbs kha khh khk khn kho khs kkb kkh kkk kkn kks kn- kna knk knn kno koa kob koh kok kon koo kos ksa ksb ksh ksk ksn kso kss naa nab nah nak nan nao nas nba nbb nbk nbn nbo nbs nha nhb nhh nhk nhn nhs nka nkk nkn nko nks nna nnb nnh nnk nnn nno nns no- noa nob noh nok non noo nos nsa nsb nsh nsk nsn nso nss oaa oab oah oak oan oao oas ob- oba obb obh obk obn obo obs oha ohh ohn oho ohs oka okb okk oko oks on- ona onb onh onk onn ono ons oo- ooa oob ooh ook oon ooo oos os- osa osb osh osk osn oso oss saa sab sah sak san sao sas sba sbb sbh sbk sbn sbo sbs sh- sha shb shh shk shn sho shs sk- ska skb skh skk sko sks sna snb snk snn sno sns soa sob soh sok son soo sos ss- ssa ssb ssh ssk ssn sso sss