-al a-a a-b aaa aab aad aae aal aax ab- aba abb abd abe abl abx ad- ada adb add ade adl adx aea aeb aed aee ael aex al- ala alb ald ale all alx ax- axa axe axl axx baa bab bad bae bal bax bba bbb bbd bbe bbl bbx bda bdb bdd bde bdl bdx be- bea beb bed bee bel bex bla blb bld ble bll blx bxb bxd bxl bxx daa dab dad dae dal dax dba dbb dbd dbe dbl dbx dda ddb ddd dde ddl ddx de- dea deb ded dee del dex dl- dla dlb dld dle dll dlx dxd dxl dxx eaa eab ead eae eal eax eba ebb ebd ebe ebl ebx ed- eda edb edd ede edl edx eea eeb eed eee eel eex ela elb eld ele ell elx ex- exa exd exe exl exx la- laa lab lad lae lal lax lba lbb lbd lbe lbl lbx lda ldb ldd lde ldl lea leb led lee lel lex lla llb lld lle lll lxd lxx xaa xad xal xbe xbl xbx xda xdb xde xed xee xel xex xla xlb xld xxl xxx