a-a a-b a-t aaa aab aad aak aan aao aat ab- aba abb abd abk abn abo abt ad- ada adb add adk adn ado adt aka akb akd akk akn ako an- ana anb and ank ann ano ant aoa aob aod aok aon aoo aot at- ata atb atd atn ato att baa bab bad bak ban bao bat bba bbb bbd bbk bbn bbo bbt bda bdb bdd bdk bdo bdt bka bkb bkk bkn bko bkt bna bnb bnd bnk bnn bno bnt boa bob bod bok bon boo bot bta btb btd btk btn bto btt daa dab dad dak dan dao dat dba dbb dbd dbk dbn dbo dbt dda ddb ddd ddk ddn ddo ddt dka dkb dkk dko dkt dna dnb dnd dnk dnn dno dnt doa dob dod dok don doo dot dta dtb dtd dtk dtn dto dtt k-t ka- kaa kab kad kak kan kao kat kba kbb kbd kbk kbn kbo kda kdb kdk kdo kdt kkb kkk kkn kkt kn- kna knd knk knn kno knt koa kob kod kok kon koo kot kta ktb ktk ktn kto ktt naa nab nad nak nan nao nat nba nbb nbd nbk nbn nbo nbt nda ndb ndd ndk ndn ndo ndt nka nkk nkn nko nkt nna nnb nnk nnn nno nnt no- noa nob nod nok non noo not nta ntb ntd ntk ntn nto ntt oaa oab oad oak oan oao oat ob- oba obb obd obk obn obo obt oda odb odd odn odo odt oka okb okd okk oko on- ona onb ond onk onn ono ont oo- ooa oob ood ook oon ooo oot ot- ota otb otd otk otn oto ott taa tab tad tak tan tao tat tba tbb tbd tbk tbn tbo tbt tda tdb tdd tdk tdn tdo tdt tka tkb tkk tko tkt tna tnb tnd tnk tnn tno tnt to- toa tob tod tok ton too tot tta ttb ttd ttk ttn tto ttt