a-a a-b aaa aab aad aaf aaj aan ab- aba abb abd abf abj abn ad- ada adb add adf adj adn af- afa afb afd aff afj afn aja ajb ajd ajf ajj ajn an- ana anb and anf anj ann baa bab bad baf baj ban bba bbb bbd bbf bbn bda bdb bdd bdf bdj bfa bfb bfd bff bfj bfn bja bjd bjf bjj bjn bna bnb bnd bnf bnj bnn daa dab dad daf daj dan dba dbb dbd dbf dbn dda ddb ddd ddf ddn dfa dfb dfd dff dfj dfn dj- dja djb djd djf dna dnb dnd dnf dnj dnn faa fab fad faf faj fan fba fbb fbd fbf fbn fda fdb fdd fdf fdj fdn ffa ffd fff ffn fja fjb fjd fna fnb fnd fnf fnj fnn j-d jaa jab jad jaf jaj jan jba jbf jbj jda jdb jdf jdn jfa jfb jfd jff jfj jja jjb jjf jjj jna jnd jnf jnj jnn naa nab nad naf naj nan nba nbb nbd nbf nbn nda ndb ndd ndf ndn nfa nfb nfd nff nfn nja njf njn nna nnb nnf nnn