-al a-a a-b a-c aaa aab aac aad aae aal ab- aba abb abc abd abe abl ac- aca acb acc acd ace acl ad- ada adb adc add ade adl aea aeb aec aed aee ael al- ala alb alc ald ale all baa bab bac bad bae bal bba bbb bbc bbd bbe bbl bca bcb bcc bcd bce bcl bda bdb bdc bdd bde bdl be- bea beb bec bed bee bel bla blb blc bld ble bll c-- caa cab cac cad cae cal cba cbb cbc cbd cbe cbl cca ccb ccc ccd cce ccl cda cdb cdc cdd cde cdl ce- cea ceb cec ced cee cel cl- cla clb clc cld cle cll daa dab dac dad dae dal dba dbb dbc dbd dbe dbl dca dcb dcc dcd dce dcl dda ddb ddc ddd dde ddl de- dea deb dec ded dee del dl- dla dlb dlc dld dle dll eaa eab eac ead eae eal eba ebb ebc ebd ebe ebl ec- eca ecb ecc ecd ece ecl ed- eda edb edc edd ede edl eea eeb eec eed eee eel ela elb elc eld ele ell la- laa lab lac lad lae lal lba lbb lbc lbd lbe lbl lca lcb lcc lcd lce lcl lda ldb ldc ldd lde ldl lea leb lec led lee lel lla llb llc lld lle lll