a-a a-b aaa aab aaf aah aan aas ab- aba abb abf abh abn abs af- afa afb aff afh afn afs aha ahb ahf ahh ahn ahs an- ana anb anf anh ann ans as- asa asb asf ash asn ass baa bab baf bah ban bas bba bbb bbf bbh bbn bbs bfa bfb bff bfh bfn bfs bha bhb bhf bhh bhs bna bnb bnf bnn bns bsa bsb bsf bsh bsn bss faa fab faf fah fan fas fba fbb fbf fbh fbn fbs ffa fff ffh ffn ffs fha fhb fhf fhh fhn fhs fna fnb fnf fnh fnn fns fsa fsb fsf fsh fsn fss haa hab haf hah han has hba hbb hbf hbh hbn hbs hfa hfb hff hfh hfn hfs hha hhb hhf hhh hhn hhs hna hnb hnf hnh hnn hns hsa hsb hsf hsh hsn hss naa nab naf nah nan nas nba nbb nbf nbn nbs nfa nfb nff nfn nfs nha nhb nhf nhh nhn nhs nna nnb nnf nnh nnn nns nsa nsb nsf nsh nsn nss saa sab saf sah san sas sba sbb sbf sbh sbn sbs sfa sfb sff sfh sfn sfs sh- sha shb shf shh shn shs sna snb snf snn sns ss- ssa ssb ssf ssh ssn sss