a-a a-b aaa aab aae aaj aan aao ab- aba abb abe abj abn abo aea aeb aee aej aen aeo aja ajb aje ajj ajn ajo an- ana anb ane anj ann ano aoa aob aoe aoj aon aoo baa bab bae baj ban bao bba bbb bbe bbn bbo be- bea beb bee ben beo bja bjj bjn bna bnb bne bnj bnn bno boa bob boe boj bon boo eaa eab eae eaj ean eao eba ebb ebe ebj ebn ebo eea eeb eee een eeo eja ejo en- ena enb ene enn eno eo- eoa eob eoe eon eoo jaa jab jae jaj jan jao jba jbj jbo jea jeb jee jej jen jeo jja jjb jjj jna jne jnj jnn jno joa job joe joj jon joo naa nab nae naj nan nao nba nbb nbe nbn nbo ne- nea neb nee nej nen neo nja nje njn nna nnb nne nnn nno no- noa nob noe noj non noo oaa oab oae oaj oan oao ob- oba obb obe obj obn obo oea oeb oee oen oeo oja ojb oje ojo on- ona onb one onj onn ono oo- ooa oob oon ooo