-al a-a a-b a-c aaa aab aac aad aae aak aal ab- aba abb abc abd abe abk abl ac- aca acb acc acd ace ack acl ad- ada adb adc add ade adk adl aea aeb aec aed aee aek ael aka akb akc akd ake akk akl al- ala alb alc ald ale alk all baa bab bac bad bae bak bal bba bbb bbc bbd bbe bbk bbl bca bcb bcc bcd bce bck bcl bda bdb bdc bdd bde bdk bdl be- bea beb bec bed bee bek bel bka bkb bkc bke bkk bkl bla blb blc bld ble blk bll c-- caa cab cac cad cae cak cal cba cbb cbc cbd cbe cbk cbl cca ccb ccc ccd cce cck ccl cda cdb cdc cdd cde cdk cdl ce- cea ceb cec ced cee cek cel cka ckb ckc ckd cl- cla clb clc cld cle clk cll daa dab dac dad dae dak dal dba dbb dbc dbd dbe dbk dbl dca dcb dcc dcd dce dck dcl dda ddb ddc ddd dde ddk ddl de- dea deb dec ded dee dek del dka dkb dkc dke dkk dkl dl- dla dlb dlc dld dle dlk dll eaa eab eac ead eae eak eal eba ebb ebc ebd ebe ebk ebl ec- eca ecb ecc ecd ece eck ecl ed- eda edb edc edd ede edk edl eea eeb eec eed eee eek eel eka ekb ekc ekd eke ekl ela elb elc eld ele elk ell ka- kaa kab kac kad kae kak kal kba kbb kbc kbd kbe kbk kbl kca kcb kcc kcd kce kck kcl kda kdb kdc kde kdk kdl ke- kea keb kec ked kee kek kel kkb kkc kke kkk kkl kl- kla klb klc kld la- laa lab lac lad lae lak lal lba lbb lbc lbd lbe lbk lbl lca lcb lcc lcd lce lck lcl lda ldb ldc ldd lde ldk ldl lea leb lec led lee lek lel lka lkb lkl lla llb llc lld lle llk lll