a-a a-b a-i aaa aab aad aai aak aan aao aar ab- aba abb abd abi abk abn abo abr ad- ada adb add adi adk adn ado adr ai- aia aib aid aii aik ain aio air aka akb akd aki akk akn ako akr an- ana anb and ani ank ann ano anr aoa aob aod aoi aok aon aoo aor ar- ara arb ard ari ark arn aro arr baa bab bad bai bak ban bao bar bba bbb bbd bbi bbk bbn bbo bbr bda bdb bdd bdi bdk bdo bdr bi- bia bib bid bii bik bin bio bir bka bkb bkk bkn bko bkr bna bnb bnd bni bnk bnn bno bnr boa bob bod boi bok bon boo bor bra brb brd bri brk brn bro brr daa dab dad dai dak dan dao dar dba dbb dbd dbi dbk dbn dbo dbr dda ddb ddd ddi ddk ddn ddo ddr di- dia dib did dii dik din dio dir dka dkb dki dkk dko dkr dna dnb dnd dni dnk dnn dno dnr doa dob dod doi dok don doo dor dra drb drd dri drk drn dro drr i-d ia- iaa iab iad iai ian iao iar iba ibb ibd ibi ibk ibn ibo ibr ida idb idd idi idk idn ido idr iia iib iid iii iin iio iir ika ikb iki ikk iko ikr in- ina inb ind ini ink inn ino inr io- ioa iob iod ioi ion ioo ior ir- ira irb ird iri irk irn iro irr ka- kaa kab kad kai kak kan kao kar kba kbb kbd kbi kbk kbn kbo kbr kda kdb kdk kdo kdr kia kib kid kii kik kin kio kir kkb kki kkk kkn kkr kn- kna knd kni knk knn kno knr koa kob kod koi kok kon koo kor kra krd kri krk krn kro krr n-i naa nab nad nai nak nan nao nar nba nbb nbd nbi nbk nbn nbo nbr nda ndb ndd ndi ndk ndn ndo ndr nia nib nid nii nik nin nio nir nka nki nkk nkn nko nkr nna nnb nni nnk nnn nno no- noa nob nod noi nok non noo nor nra nrb nrd nri nrk nrn nro nrr o-i oaa oab oad oai oak oan oao oar ob- oba obb obd obi obk obn obo obr oda odb odd odi odn odo odr oia oib oid oii oik oin oio oir oka okb okd oki okk oko okr on- ona onb ond oni onk onn ono onr oo- ooa oob ood ooi ook oon ooo oor or- ora orb ord ori ork orn oro orr ra- raa rab rad rai rak ran rao rar rba rbb rbd rbi rbk rbn rbo rbr rda rdb rdd rdi rdn rdo rdr ria rib rid rii rik rin rio rir rkb rkk rko rna rnb rnd rni rnn rno rnr roa rob rod roi rok ron roo ror rra rrb rrd rri rrk rrn rrr