a-a a-b a-c a-t aaa aab aac aad aae aaf aat ab- aba abb abc abd abe abf abt ac- aca acb acc acd ace acf act ad- ada adb adc add ade adf adt aea aeb aec aed aee aef aet af- afa afb afc afd afe aff aft at- ata atb atc atd ate atf att baa bab bac bad bae baf bat bba bbb bbc bbd bbe bbf bbt bca bcb bcc bcd bce bcf bct bda bdb bdc bdd bde bdf bdt be- bea beb bec bed bee bef bet bfa bfb bfc bfd bfe bff bft bta btb btc btd bte btf btt c-- caa cab cac cad cae caf cat cba cbb cbc cbd cbe cbf cbt cca ccb ccc ccd cce ccf cct cda cdb cdc cdd cde cdf cdt ce- cea ceb cec ced cee cef cet cfa cfb cfc cfd cfe cff cft cta ctb ctc ctd cte ctf ctt daa dab dac dad dae daf dat dba dbb dbc dbd dbe dbf dbt dca dcb dcc dcd dce dcf dct dda ddb ddc ddd dde ddf ddt de- dea deb dec ded dee def det dfa dfb dfc dfd dfe dff dft dta dtb dtc dtd dte dtf dtt eaa eab eac ead eae eaf eat eba ebb ebc ebd ebe ebf ebt ec- eca ecb ecc ecd ece ecf ect ed- eda edb edc edd ede edf edt eea eeb eec eed eee eef eet ef- efa efb efc efd efe eff eft eta etb etc etd ete etf ett faa fab fac fad fae faf fat fba fbb fbc fbd fbe fbf fbt fca fcb fcc fcd fce fcf fct fda fdb fdc fdd fde fdf fdt fea feb fec fed fee fef fet ffa ffc ffd ffe fff fft fta ftb ftc ftd fte ftf ftt taa tab tac tad tae taf tat tba tbb tbc tbd tbe tbf tbt tca tcb tcc tcd tce tcf tct tda tdb tdc tdd tde tdf tdt te- tea teb tec ted tee tef tet tfa tfb tfc tfd tfe tff tft tta ttb ttc ttd tte ttf ttt