a-a a-b a-t aaa aab aad aae aaf aag aak aat ab- aba abb abd abe abf abg abk abt ad- ada adb add ade adf adg adk adt aea aeb aed aee aef aeg aek aet af- afa afb afd afe aff afg afk aft ag- aga agb agd age agf agg agk agt aka akb akd ake akg akk at- ata atb atd ate atf atg att baa bab bad bae baf bag bak bat bba bbb bbd bbe bbf bbg bbk bbt bda bdb bdd bde bdf bdg bdk bdt be- bea beb bed bee bef beg bek bet bfa bfb bfd bfe bff bfg bft bga bgb bgd bge bgf bgg bgk bgt bka bkb bke bkf bkg bkk bkt bta btb btd bte btf btg btk btt daa dab dad dae daf dag dak dat dba dbb dbd dbe dbf dbg dbk dbt dda ddb ddd dde ddf ddg ddk ddt de- dea deb ded dee def deg dek det dfa dfb dfd dfe dff dfg dfk dft dga dgd dge dgf dgg dgk dgt dka dkb dke dkg dkk dkt dta dtb dtd dte dtf dtg dtk dtt eaa eab ead eae eaf eag eak eat eba ebb ebd ebe ebf ebg ebk ebt ed- eda edb edd ede edf edg edk edt eea eeb eed eee eef eeg eek eet ef- efa efb efd efe eff efg eft ega egb egd ege egf egg egt eka ekb ekd eke ekf ekg ekt eta etb etd ete etf etg etk ett faa fab fad fae faf fag fak fat fba fbb fbd fbe fbf fbg fbk fbt fda fdb fdd fde fdf fdg fdk fdt fea feb fed fee fef feg fek fet ffa ffd ffe fff ffg ffk fft fga fgb fgd fge fgf fgg fgt fka fkb fkf fkg fkk fkt fta ftb ftd fte ftf ftg ftk ftt g-d gaa gab gad gae gaf gag gak gat gba gbd gbe gbf gbg gbk gbt gda gdb gdd gde gdf gdk gdt ge- gea geb ged gee gef geg gek get gfa gfb gfd gfe gff gfk gft gga ggb ggd ggg ggt gka gkb gkd gkt gta gtb gtd gte gtf gtg gtk gtt k-t ka- kaa kab kad kae kaf kag kak kat kba kbb kbd kbe kbf kbk kda kdb kde kdf kdg kdk kdt ke- kea keb ked kee kef keg kek ket kfa kfd kff kfg kga kgb kgd kgf kkb kke kkk kkt kta ktb kte ktf ktg ktk ktt taa tab tad tae taf tag tak tat tba tbb tbd tbe tbf tbg tbk tbt tda tdb tdd tde tdf tdg tdk tdt te- tea teb ted tee tef teg tek tet tfa tfb tfd tfe tff tfg tfk tft tga tgb tge tgf tgg tgk tgt tka tkb tke tkg tkk tkt tta ttb ttd tte ttf ttg ttk ttt