a-a aaa aaf aag aak aan af- afa aff afg afk afn ag- aga agf agg agk agn aka akg akk akn an- ana anf ang ank ann faa faf fag fak fan ffa fff ffg ffk ffn fga fgf fgg fgn fka fkf fkg fkk fna fnf fng fnk fnn gaa gaf gag gak gan gfa gff gfk gga ggg ggn gka gkn gna gnf gnn ka- kaa kaf kag kak kan kfa kff kfg kga kgf kkk kkn kn- kna knf kng knk knn naa naf nag nak nan nfa nff nfk nfn nga ngf ngg ngk ngn nka nkf nkk nkn nna nnf nng nnk nnn