a-a a-b a-c aaa aab aac aae aaj aao ab- aba abb abc abe abj abo ac- aca acb acc ace acj aco aea aeb aec aee aej aeo aja ajb ajc aje ajj ajo aoa aob aoc aoe aoj aoo baa bab bac bae baj bao bba bbb bbc bbe bbo bca bcb bcc bce bcj bco be- bea beb bec bee beo bja bjc bjj boa bob boc boe boj boo c-- c-j caa cab cac cae caj cao cba cbb cbc cbe cbj cbo cca ccb ccc cce ccj cco ce- cea ceb cec cee cej ceo cja cjb cjc co- coa cob coc coe coj coo eaa eab eac eae eaj eao eba ebb ebc ebe ebj ebo ec- eca ecb ecc ece ecj eco eea eeb eec eee eeo eja ejc ejo eo- eoa eob eoc eoe eoo jaa jab jac jae jaj jao jba jbc jbj jbo jca jcb jcc jce jco jea jeb jec jee jej jeo jja jjb jjc jjj joa job joc joe joj joo oaa oab oac oae oaj oao ob- oba obb obc obe obj obo oc- oca ocb occ ocj oco oea oeb oec oee oeo oja ojb ojc oje ojo oo- ooa oob ooc ooo