a-a a-b a-i aaa aab aad aaf aai aan aao aar ab- aba abb abd abf abi abn abo abr ad- ada adb add adf adi adn ado adr af- afa afb afd aff afi afn afo afr ai- aia aib aid aif aii ain aio air an- ana anb and anf ani ann ano anr aoa aob aod aof aoi aon aoo aor ar- ara arb ard arf ari arn aro arr baa bab bad baf bai ban bao bar bba bbb bbd bbf bbi bbn bbo bbr bda bdb bdd bdf bdi bdo bdr bfa bfb bfd bff bfi bfn bfo bfr bi- bia bib bid bif bii bin bio bir bna bnb bnd bnf bni bnn bno bnr boa bob bod bof boi bon boo bor bra brb brd brf bri brn bro brr daa dab dad daf dai dan dao dar dba dbb dbd dbf dbi dbn dbo dbr dda ddb ddd ddf ddi ddn ddo ddr dfa dfb dfd dff dfi dfn dfo dfr di- dia dib did dif dii din dio dir dna dnb dnd dnf dni dnn dno dnr doa dob dod dof doi don doo dor dra drb drd dri drn dro drr faa fab fad faf fai fan fao far fba fbb fbd fbf fbi fbn fbo fbr fda fdb fdd fdf fdi fdn fdo fdr ffa ffd fff ffi ffn ffo ffr fia fib fid fif fii fin fir fna fnb fnd fnf fni fnn fnr foa fob fof foi fon foo for fra frb frd frf fri frn fro frr i-d i-f ia- iaa iab iad iaf iai ian iao iar iba ibb ibd ibf ibi ibn ibo ibr ida idb idd idf idi idn ido idr ifa ifb ifd iff ifi ifn ifo ifr iia iib iid iif iii iin iio iir in- ina inb ind inf ini inn ino inr io- ioa iob iod iof ioi ion ioo ior ir- ira irb ird irf iri irn iro irr n-i naa nab nad naf nai nan nao nar nba nbb nbd nbf nbi nbn nbo nbr nda ndb ndd ndf ndi ndn ndo ndr nfa nfb nfd nff nfi nfn nfo nfr nia nib nid nif nii nin nio nir nna nnb nnf nni nnn nno no- noa nob nod nof noi non noo nor nra nrb nrd nrf nri nrn nro nrr o-i oaa oab oad oaf oai oan oao oar ob- oba obb obd obf obi obn obo obr oda odb odd odf odi odn odo odr of- ofa ofb ofd off ofi ofn ofo ofr oia oib oid oif oii oin oio oir on- ona onb ond onf oni onn ono onr oo- ooa oob ood oof ooi oon ooo oor or- ora orb ord orf ori orn oro orr ra- raa rab rad raf rai ran rao rar rba rbb rbd rbf rbi rbn rbo rbr rda rdb rdd rdf rdi rdn rdo rdr rfa rfb rfd rff rfi rfn rfo rfr ria rib rid rif rii rin rio rir rna rnb rnd rni rnn rno rnr roa rob rod rof roi ron roo ror rra rrb rrd rrf rri rrn rrr