a-a a-b a-i a-t aaa aab aae aai aak aao aat ab- aba abb abe abi abk abo abt aea aeb aee aei aek aeo aet ai- aia aib aie aii aik aio ait aka akb ake aki akk ako aoa aob aoe aoi aok aoo aot at- ata atb ate ati ato att baa bab bae bai bak bao bat bba bbb bbe bbi bbk bbo bbt be- bea beb bee bei bek beo bet bi- bia bib bie bii bik bio bit bka bkb bke bkk bko bkt boa bob boe boi bok boo bot bta btb bte bti btk bto btt eaa eab eae eai eak eao eat eba ebb ebe ebi ebk ebo ebt eea eeb eee eek eeo eet eia eib eie eii eik eio eit eka ekb eke eki eko ekt eo- eoa eob eoe eoi eok eoo eot eta etb ete eti etk eto ett ia- iaa iab iae iai iao iat iba ibb ibe ibi ibk ibo ibt ie- iea iee iei iek iet iia iib iie iii iio iit ika ikb ike iki ikk iko ikt io- ioa iob ioe ioi ioo iot ita itb ite iti itk ito itt k-t ka- kaa kab kae kai kak kao kat kba kbb kbe kbi kbk kbo ke- kea keb kee kei kek keo ket kia kib kie kii kik kio kit kkb kke kki kkk kkt koa kob koe koi kok koo kot kta ktb kte ktk kto ktt o-i oaa oab oae oai oak oao oat ob- oba obb obe obi obk obo obt oea oeb oee oei oeo oet oia oib oie oii oik oio oit oka okb oke oki okk oko oo- ooa oob ooi ook ooo oot ot- ota otb ote oti otk oto ott taa tab tae tai tak tao tat tba tbb tbe tbi tbk tbo tbt te- tea teb tee tei tek teo tet tia tib tie tii tik tio tit tka tkb tke tkk tko tkt to- toa tob toe toi tok too tot tta ttb tte tti ttk tto ttt