a-a a-b aaa aab aaj aao aas ab- aba abb abj abo abs aja ajb ajj ajo ajs aoa aob aoj aoo aos as- asa asb asj aso ass baa bab baj bao bas bba bbb bbo bbs bja bjj bjs boa bob boj boo bos bsa bsb bsj bso bss jaa jab jaj jao jas jba jbj jbo jbs jja jjb jjj jjs joa job joj joo jos jsa jsb jsj jso jss oaa oab oaj oao oas ob- oba obb obj obo obs oja ojb ojo ojs oo- ooa oob ooo oos os- osa osb osj oso oss saa sab saj sao sas sba sbb sbj sbo sbs sja sjb sjj sjs soa sob soj soo sos ss- ssa ssb ssj sso sss