a-a aaa aad aaf aan aar ad- ada add adf adn adr af- afa afd aff afn afr an- ana and anf ann anr ar- ara ard arf arn arr daa dad daf dan dar dda ddd ddf ddn ddr dfa dfd dff dfn dfr dna dnd dnf dnn dnr dra drd drn drr faa fad faf fan far fda fdd fdf fdn fdr ffa ffd fff ffn ffr fna fnd fnf fnn fnr fra frd frf frn frr naa nad naf nan nar nda ndd ndf ndn ndr nfa nfd nff nfn nfr nna nnf nnn nra nrd nrf nrn nrr ra- raa rad raf ran rar rda rdd rdf rdn rdr rfa rfd rff rfn rfr rna rnd rnn rnr rra rrd rrf rrn rrr