a-a a-b a-c aaa aab aac aaj aan aao aas ab- aba abb abc abj abn abo abs ac- aca acb acc acj acn aco acs aja ajb ajc ajj ajn ajo ajs an- ana anb anc anj ann ano ans aoa aob aoc aoj aon aoo aos as- asa asb asc asj asn aso ass baa bab bac baj ban bao bas bba bbb bbc bbn bbo bbs bca bcb bcc bcj bcn bco bcs bja bjc bjj bjn bjs bna bnb bnc bnj bnn bno bns boa bob boc boj bon boo bos bsa bsb bsc bsj bsn bso bss c-- c-j caa cab cac caj can cao cas cba cbb cbc cbj cbn cbo cbs cca ccb ccc ccj ccn cco ccs cja cjb cjc cjs cn- cna cnb cnc cnj cnn cno cns co- coa cob coc coj con coo cos csa csb csc csj csn cso css jaa jab jac jaj jan jao jas jba jbc jbj jbo jbs jca jcb jcc jco jcs jja jjb jjc jjj jjs jna jnc jnj jnn jno jns joa job joc joj jon joo jos jsa jsb jsc jsj jsn jso jss naa nab nac naj nan nao nas nba nbb nbc nbn nbo nbs nca ncb ncc ncn nco ncs nja njc njn njs nna nnb nnc nnn nno nns no- noa nob noc noj non noo nos nsa nsb nsc nsn nso nss oaa oab oac oaj oan oao oas ob- oba obb obc obj obn obo obs oc- oca ocb occ ocj ocn oco ocs oja ojb ojc ojo ojs on- ona onb onc onj onn ono ons oo- ooa oob ooc oon ooo oos os- osa osb osc osj osn oso oss saa sab sac saj san sao sas sba sbb sbc sbj sbn sbo sbs sca scb scc scj scn sco scs sja sjb sjc sjj sjs sna snb snc snj snn sno sns soa sob soc soj son soo sos ss- ssa ssb ssc ssj ssn sso sss