a-a a-b a-c aaa aab aac aaj aao aas ab- aba abb abc abj abo abs ac- aca acb acc acj aco acs aja ajb ajc ajj ajo ajs aoa aob aoc aoj aoo aos as- asa asb asc asj aso ass baa bab bac baj bao bas bba bbb bbc bbo bbs bca bcb bcc bcj bco bcs bja bjc bjj bjs boa bob boc boj boo bos bsa bsb bsc bsj bso bss c-- c-j caa cab cac caj cao cas cba cbb cbc cbj cbo cbs cca ccb ccc ccj cco ccs cja cjb cjc cjs co- coa cob coc coj coo cos csa csb csc csj cso css jaa jab jac jaj jao jas jba jbc jbj jbo jbs jca jcb jcc jco jcs jja jjb jjc jjj jjs joa job joc joj joo jos jsa jsb jsc jsj jso jss oaa oab oac oaj oao oas ob- oba obb obc obj obo obs oc- oca ocb occ ocj oco ocs oja ojb ojc ojo ojs oo- ooa oob ooc ooo oos os- osa osb osc osj oso oss saa sab sac saj sao sas sba sbb sbc sbj sbo sbs sca scb scc scj sco scs sja sjb sjc sjj sjs soa sob soc soj soo sos ss- ssa ssb ssc ssj sso sss