a-a a-b a-t aaa aab aaj aao aat ab- aba abb abj abo abt aja ajb ajj ajo ajt aoa aob aoj aoo aot at- ata atb ato att baa bab baj bao bat bba bbb bbo bbt bja bjj bjt boa bob boj boo bot bta btb bto btt jaa jab jaj jao jat jba jbj jbo jbt jja jjb jjj joa job joj joo jot jta jtb jtt oaa oab oaj oao oat ob- oba obb obj obo obt oja ojb ojo oo- ooa oob ooo oot ot- ota otb oto ott taa tab taj tao tat tba tbb tbj tbo tbt tjo to- toa tob toj too tot tta ttb tto ttt