a-a a-b aaa aab aah aan aas ab- aba abb abh abn abs aha ahb ahh ahn ahs an- ana anb anh ann ans as- asa asb ash asn ass baa bab bah ban bas bba bbb bbh bbn bbs bha bhb bhh bhs bna bnb bnn bns bsa bsb bsh bsn bss haa hab hah han has hba hbb hbh hbn hbs hha hhb hhh hhn hhs hna hnb hnh hnn hns hsa hsb hsh hsn hss naa nab nah nan nas nba nbb nbn nbs nha nhb nhh nhn nhs nna nnb nnh nnn nns nsa nsb nsh nsn nss saa sab sah san sas sba sbb sbh sbn sbs sh- sha shb shh shn shs sna snb snn sns ss- ssa ssb ssh ssn sss