a-a a-b a-i aaa aab aad aaf aai aan aar ab- aba abb abd abf abi abn abr ad- ada adb add adf adi adn adr af- afa afb afd aff afi afn afr ai- aia aib aid aif aii ain air an- ana anb and anf ani ann anr ar- ara arb ard arf ari arn arr baa bab bad baf bai ban bar bba bbb bbd bbf bbi bbn bbr bda bdb bdd bdf bdi bdr bfa bfb bfd bff bfi bfn bfr bi- bia bib bid bif bii bin bir bna bnb bnd bnf bni bnn bnr bra brb brd brf bri brn brr daa dab dad daf dai dan dar dba dbb dbd dbf dbi dbn dbr dda ddb ddd ddf ddi ddn ddr dfa dfb dfd dff dfi dfn dfr di- dia dib did dif dii din dir dna dnb dnd dnf dni dnn dnr dra drb drd dri drn drr faa fab fad faf fai fan far fba fbb fbd fbf fbi fbn fbr fda fdb fdd fdf fdi fdn fdr ffa ffd fff ffi ffn ffr fia fib fid fif fii fin fir fna fnb fnd fnf fni fnn fnr fra frb frd frf fri frn frr i-d i-f ia- iaa iab iad iaf iai ian iar iba ibb ibd ibf ibi ibn ibr ida idb idd idf idi idn idr ifa ifb ifd iff ifi ifn ifr iia iib iid iif iii iin iir in- ina inb ind inf ini inn inr ir- ira irb ird irf iri irn irr n-i naa nab nad naf nai nan nar nba nbb nbd nbf nbi nbn nbr nda ndb ndd ndf ndi ndn ndr nfa nfb nfd nff nfi nfn nfr nia nib nid nif nii nin nir nna nnb nnf nni nnn nra nrb nrd nrf nri nrn nrr ra- raa rab rad raf rai ran rar rba rbb rbd rbf rbi rbn rbr rda rdb rdd rdf rdi rdn rdr rfa rfb rfd rff rfi rfn rfr ria rib rid rif rii rin rir rna rnb rnd rni rnn rnr rra rrb rrd rrf rri rrn rrr