a-a a-b a-c aaa aab aac aad aaj aao ab- aba abb abc abd abj abo ac- aca acb acc acd acj aco ad- ada adb adc add adj ado aja ajb ajc ajd ajj ajo aoa aob aoc aod aoj aoo baa bab bac bad baj bao bba bbb bbc bbd bbo bca bcb bcc bcd bcj bco bda bdb bdc bdd bdj bdo bja bjc bjd bjj boa bob boc bod boj boo c-- c-j caa cab cac cad caj cao cba cbb cbc cbd cbj cbo cca ccb ccc ccd ccj cco cda cdb cdc cdd cdj cdo cja cjb cjc cjd co- coa cob coc cod coj coo daa dab dac dad daj dao dba dbb dbc dbd dbo dca dcb dcc dcd dco dda ddb ddc ddd ddo dj- dja djb djc djd djo doa dob doc dod doj doo j-d jaa jab jac jad jaj jao jba jbc jbj jbo jca jcb jcc jcd jco jda jdb jdc jdo jja jjb jjc jjj joa job joc jod joj joo oaa oab oac oad oaj oao ob- oba obb obc obd obj obo oc- oca ocb occ ocd ocj oco oda odb odc odd odo oja ojb ojc ojd ojo oo- ooa oob ooc ood ooo