a-a a-b aaa aab aan aas aav ab- aba abb abn abs abv an- ana anb ann ans anv as- asa asb asn ass asv av- ava avb avn avs baa bab ban bas bav bba bbb bbn bbs bna bnb bnn bns bnv bsa bsb bsn bss bsv bva bvb bvn bvs bvv naa nab nan nas nav nba nbb nbn nbs nbv nna nnb nnn nns nnv nsa nsb nsn nss nsv nva nvb nvn nvv saa sab san sas sav sba sbb sbn sbs sbv sna snb snn sns snv ss- ssa ssb ssn sss ssv sva svb svn svs svv v-a vaa vab van vas vav vba vbs vbv vn- vna vns vnv vsa vsb vsn vss vsv vva vvb vvs vvv