a-a a-b a-c a-t aaa aab aac aad aae aak aat ab- aba abb abc abd abe abk abt ac- aca acb acc acd ace ack act ad- ada adb adc add ade adk adt aea aeb aec aed aee aek aet aka akb akc akd ake akk at- ata atb atc atd ate att baa bab bac bad bae bak bat bba bbb bbc bbd bbe bbk bbt bca bcb bcc bcd bce bck bct bda bdb bdc bdd bde bdk bdt be- bea beb bec bed bee bek bet bka bkb bkc bke bkk bkt bta btb btc btd bte btk btt c-- caa cab cac cad cae cak cat cba cbb cbc cbd cbe cbk cbt cca ccb ccc ccd cce cck cct cda cdb cdc cdd cde cdk cdt ce- cea ceb cec ced cee cek cet cka ckb ckc ckd ckt cta ctb ctc ctd cte ctk ctt daa dab dac dad dae dak dat dba dbb dbc dbd dbe dbk dbt dca dcb dcc dcd dce dck dct dda ddb ddc ddd dde ddk ddt de- dea deb dec ded dee dek det dka dkb dkc dke dkk dkt dta dtb dtc dtd dte dtk dtt eaa eab eac ead eae eak eat eba ebb ebc ebd ebe ebk ebt ec- eca ecb ecc ecd ece eck ect ed- eda edb edc edd ede edk edt eea eeb eec eed eee eek eet eka ekb ekc ekd eke ekt eta etb etc etd ete etk ett k-t ka- kaa kab kac kad kae kak kat kba kbb kbc kbd kbe kbk kca kcb kcc kcd kce kck kct kda kdb kdc kde kdk kdt ke- kea keb kec ked kee kek ket kkb kkc kke kkk kkt kta ktb ktc kte ktk ktt taa tab tac tad tae tak tat tba tbb tbc tbd tbe tbk tbt tca tcb tcc tcd tce tck tct tda tdb tdc tdd tde tdk tdt te- tea teb tec ted tee tek tet tka tkb tkc tke tkk tkt tta ttb ttc ttd tte ttk ttt