a-a a-b aaa aab aad aaf aaj aar ab- aba abb abd abf abj abr ad- ada adb add adf adj adr af- afa afb afd aff afj afr aja ajb ajd ajf ajj ajr ar- ara arb ard arf arj arr baa bab bad baf baj bar bba bbb bbd bbf bbr bda bdb bdd bdf bdj bdr bfa bfb bfd bff bfj bfr bja bjd bjf bjj bjr bra brb brd brf brj brr daa dab dad daf daj dar dba dbb dbd dbf dbr dda ddb ddd ddf ddr dfa dfb dfd dff dfj dfr dj- dja djb djd djf dra drb drd drj drr faa fab fad faf faj far fba fbb fbd fbf fbr fda fdb fdd fdf fdj fdr ffa ffd fff ffr fja fjb fjd fra frb frd frf frj frr j-d jaa jab jad jaf jaj jar jba jbf jbj jbr jda jdb jdf jdr jfa jfb jfd jff jfj jfr jja jjb jjf jjj jjr jra jrb jrf jrr ra- raa rab rad raf raj rar rba rbb rbd rbf rbr rda rdb rdd rdf rdj rdr rfa rfb rfd rff rfj rfr rja rjf rjr rra rrb rrd rrf rrr