a-a aaa aae aaf aag aan aea aee aef aeg aen af- afa afe aff afg afn ag- aga age agf agg agn an- ana ane anf ang ann eaa eae eaf eag ean eea eee eef eeg een ef- efa efe eff efg ega ege egf egg egn en- ena ene enf eng enn faa fae faf fag fan fea fee fef feg fen ffa ffe fff ffg ffn fga fge fgf fgg fgn fna fne fnf fng fnn gaa gae gaf gag gan ge- gea gee gef geg gen gfa gfe gff gga ggg ggn gna gne gnf gnn naa nae naf nag nan ne- nea nee nef neg nen nfa nfe nff nfn nga nge ngf ngg ngn nna nne nnf nng nnn