a-a a-b a-c a-t aaa aab aac aad aae aao aat ab- aba abb abc abd abe abo abt ac- aca acb acc acd ace aco act ad- ada adb adc add ade ado adt aea aeb aec aed aee aeo aet aoa aob aoc aod aoe aoo aot at- ata atb atc atd ate ato att baa bab bac bad bae bao bat bba bbb bbc bbd bbe bbo bbt bca bcb bcc bcd bce bco bct bda bdb bdc bdd bde bdo bdt be- bea beb bec bed bee beo bet boa bob boc bod boe boo bot bta btb btc btd bte bto btt c-- caa cab cac cad cae cao cat cba cbb cbc cbd cbe cbo cbt cca ccb ccc ccd cce cco cct cda cdb cdc cdd cde cdo cdt ce- cea ceb cec ced cee ceo cet co- coa cob coc cod coe coo cot cta ctb ctc ctd cte cto ctt daa dab dac dad dae dao dat dba dbb dbc dbd dbe dbo dbt dca dcb dcc dcd dce dco dct dda ddb ddc ddd dde ddo ddt de- dea deb dec ded dee deo det doa dob doc dod doe doo dot dta dtb dtc dtd dte dto dtt eaa eab eac ead eae eao eat eba ebb ebc ebd ebe ebo ebt ec- eca ecb ecc ecd ece eco ect ed- eda edb edc edd ede edo edt eea eeb eec eed eee eeo eet eo- eoa eob eoc eod eoe eoo eot eta etb etc etd ete eto ett oaa oab oac oad oae oao oat ob- oba obb obc obd obe obo obt oc- oca ocb occ ocd oco oct oda odb odc odd ode odo odt oea oeb oec oed oee oeo oet oo- ooa oob ooc ood ooo oot ot- ota otb otc otd ote oto ott taa tab tac tad tae tao tat tba tbb tbc tbd tbe tbo tbt tca tcb tcc tcd tce tco tct tda tdb tdc tdd tde tdo tdt te- tea teb tec ted tee teo tet to- toa tob toc tod toe too tot tta ttb ttc ttd tte tto ttt