-al a-a a-b a-c a-t aaa aab aac aad aae aal aat ab- aba abb abc abd abe abl abt ac- aca acb acc acd ace acl act ad- ada adb adc add ade adl adt aea aeb aec aed aee ael aet al- ala alb alc ald ale all alt at- ata atb atc atd ate atl att baa bab bac bad bae bal bat bba bbb bbc bbd bbe bbl bbt bca bcb bcc bcd bce bcl bct bda bdb bdc bdd bde bdl bdt be- bea beb bec bed bee bel bet bla blb blc bld ble bll blt bta btb btc btd bte btl btt c-- caa cab cac cad cae cal cat cba cbb cbc cbd cbe cbl cbt cca ccb ccc ccd cce ccl cct cda cdb cdc cdd cde cdl cdt ce- cea ceb cec ced cee cel cet cl- cla clb clc cld cle cll clt cta ctb ctc ctd cte ctl ctt daa dab dac dad dae dal dat dba dbb dbc dbd dbe dbl dbt dca dcb dcc dcd dce dcl dct dda ddb ddc ddd dde ddl ddt de- dea deb dec ded dee del det dl- dla dlb dlc dld dle dll dlt dta dtb dtc dtd dte dtl dtt eaa eab eac ead eae eal eat eba ebb ebc ebd ebe ebl ebt ec- eca ecb ecc ecd ece ecl ect ed- eda edb edc edd ede edl edt eea eeb eec eed eee eel eet ela elb elc eld ele ell elt eta etb etc etd ete etl ett la- laa lab lac lad lae lal lat lba lbb lbc lbd lbe lbl lbt lca lcb lcc lcd lce lcl lct lda ldb ldc ldd lde ldl ldt lea leb lec led lee lel let lla llb llc lld lle lll llt lta ltb ltc ltd lte ltl ltt taa tab tac tad tae tal tat tba tbb tbc tbd tbe tbl tbt tca tcb tcc tcd tce tcl tct tda tdb tdc tdd tde tdl tdt te- tea teb tec ted tee tel tet tla tlc tld tle tll tlt tta ttb ttc ttd tte ttl ttt