a-a a-b aaa aab aaj aan aao aas ab- aba abb abj abn abo abs aja ajb ajj ajn ajo ajs an- ana anb anj ann ano ans aoa aob aoj aon aoo aos as- asa asb asj asn aso ass baa bab baj ban bao bas bba bbb bbn bbo bbs bja bjj bjn bjs bna bnb bnj bnn bno bns boa bob boj bon boo bos bsa bsb bsj bsn bso bss jaa jab jaj jan jao jas jba jbj jbo jbs jja jjb jjj jjs jna jnj jnn jno jns joa job joj jon joo jos jsa jsb jsj jsn jso jss naa nab naj nan nao nas nba nbb nbn nbo nbs nja njn njs nna nnb nnn nno nns no- noa nob noj non noo nos nsa nsb nsn nso nss oaa oab oaj oan oao oas ob- oba obb obj obn obo obs oja ojb ojo ojs on- ona onb onj onn ono ons oo- ooa oob oon ooo oos os- osa osb osj osn oso oss saa sab saj san sao sas sba sbb sbj sbn sbo sbs sja sjb sjj sjs sna snb snj snn sno sns soa sob soj son soo sos ss- ssa ssb ssj ssn sso sss