a-a a-b aaa aab aae aah aaj aao ab- aba abb abe abh abj abo aea aeb aee aeh aej aeo aha ahb ahe ahh ahj aho aja ajb aje ajh ajj ajo aoa aob aoe aoh aoj aoo baa bab bae bah baj bao bba bbb bbe bbh bbo be- bea beb bee beh beo bha bhb bhe bhh bhj bho bja bjj boa bob boe boh boj boo eaa eab eae eah eaj eao eba ebb ebe ebh ebj ebo eea eeb eee eeo eha ehb ehe ehh eho eja ejo eo- eoa eob eoe eoh eoo haa hab hae hah haj hao hba hbb hbe hbh hbj hbo he- hea heb hee heh hej heo hha hhb hhe hhh hhj hho hja hjo hoa hob hoe hoh hoo jaa jab jae jah jaj jao jba jbj jbo jea jeb jee jeh jej jeo jha jhe jhj jho jja jjb jjj joa job joe joh joj joo oaa oab oae oah oaj oao ob- oba obb obe obh obj obo oea oeb oee oeh oeo oha ohe ohh oho oja ojb oje ojo oo- ooa oob ooh ooo