a-a a-b a-t aaa aab aae aak aan aao aat ab- aba abb abe abk abn abo abt aea aeb aee aek aen aeo aet aka akb ake akk akn ako an- ana anb ane ank ann ano ant aoa aob aoe aok aon aoo aot at- ata atb ate atn ato att baa bab bae bak ban bao bat bba bbb bbe bbk bbn bbo bbt be- bea beb bee bek ben beo bet bka bkb bke bkk bkn bko bkt bna bnb bne bnk bnn bno bnt boa bob boe bok bon boo bot bta btb bte btk btn bto btt eaa eab eae eak ean eao eat eba ebb ebe ebk ebn ebo ebt eea eeb eee eek een eeo eet eka ekb eke eko ekt en- ena enb ene enk enn eno ent eo- eoa eob eoe eok eon eoo eot eta etb ete etk etn eto ett k-t ka- kaa kab kae kak kan kao kat kba kbb kbe kbk kbn kbo ke- kea keb kee kek ken keo ket kkb kke kkk kkn kkt kn- kna kne knk knn kno knt koa kob koe kok kon koo kot kta ktb kte ktk ktn kto ktt naa nab nae nak nan nao nat nba nbb nbe nbk nbn nbo nbt ne- nea neb nee nek nen neo net nka nke nkk nkn nko nkt nna nnb nne nnk nnn nno nnt no- noa nob noe nok non noo not nta ntb nte ntk ntn nto ntt oaa oab oae oak oan oao oat ob- oba obb obe obk obn obo obt oea oeb oee oen oeo oet oka okb oke okk oko on- ona onb one onk onn ono ont oo- ooa oob ook oon ooo oot ot- ota otb ote otk otn oto ott taa tab tae tak tan tao tat tba tbb tbe tbk tbn tbo tbt te- tea teb tee tek ten teo tet tka tkb tke tkk tko tkt tna tnb tne tnk tnn tno tnt to- toa tob toe tok ton too tot tta ttb tte ttk ttn tto ttt