a-a a-b a-i aaa aab aad aai aan aao aar ab- aba abb abd abi abn abo abr ad- ada adb add adi adn ado adr ai- aia aib aid aii ain aio air an- ana anb and ani ann ano anr aoa aob aod aoi aon aoo aor ar- ara arb ard ari arn aro arr baa bab bad bai ban bao bar bba bbb bbd bbi bbn bbo bbr bda bdb bdd bdi bdo bdr bi- bia bib bid bii bin bio bir bna bnb bnd bni bnn bno bnr boa bob bod boi bon boo bor bra brb brd bri brn bro brr daa dab dad dai dan dao dar dba dbb dbd dbi dbn dbo dbr dda ddb ddd ddi ddn ddo ddr di- dia dib did dii din dio dir dna dnb dnd dni dnn dno dnr doa dob dod doi don doo dor dra drb drd dri drn dro drr i-d ia- iaa iab iad iai ian iao iar iba ibb ibd ibi ibn ibo ibr ida idb idd idi idn ido idr iia iib iid iii iin iio iir in- ina inb ind ini inn ino inr io- ioa iob iod ioi ion ioo ior ir- ira irb ird iri irn iro irr n-i naa nab nad nai nan nao nar nba nbb nbd nbi nbn nbo nbr nda ndb ndd ndi ndn ndo ndr nia nib nid nii nin nio nir nna nnb nni nnn nno no- noa nob nod noi non noo nor nra nrb nrd nri nrn nro nrr o-i oaa oab oad oai oan oao oar ob- oba obb obd obi obn obo obr oda odb odd odi odn odo odr oia oib oid oii oin oio oir on- ona onb ond oni onn ono onr oo- ooa oob ood ooi oon ooo oor or- ora orb ord ori orn oro orr ra- raa rab rad rai ran rao rar rba rbb rbd rbi rbn rbo rbr rda rdb rdd rdi rdn rdo rdr ria rib rid rii rin rio rir rna rnb rnd rni rnn rno rnr roa rob rod roi ron roo ror rra rrb rrd rri rrn rrr