-al a-a a-b aaa aab aae aal aas aax ab- aba abb abe abl abs abx aea aeb aee ael aes aex al- ala alb ale all als alx as- asa asb ase asl ass asx ax- axa axe axl axs axx baa bab bae bal bas bax bba bbb bbe bbl bbs bbx be- bea beb bee bel bes bex bla blb ble bll bls blx bsa bsb bse bsl bss bsx bxb bxl bxx eaa eab eae eal eas eax eba ebb ebe ebl ebs ebx eea eeb eee eel ees eex ela elb ele ell els elx es- esa esb ese esl ess esx ex- exa exe exl exs exx la- laa lab lae lal las lax lba lbb lbe lbl lbs lbx lea leb lee lel les lex lla llb lle lll lls lsa lsb lse lsl lss lxx saa sab sae sal sas sax sba sbb sbe sbl sbs sbx se- sea seb see sel ses sex sla slb sle sll sls slx ss- ssa ssb sse ssl sss ssx sxl sxs xaa xal xas xbe xbl xbx xee xel xes xex xla xlb xls xsa xsb xsl xss xxl xxx