-al a-a a-c aaa aac aae aal aas aax ac- aca acc ace acl acs acx aea aec aee ael aes aex al- ala alc ale all als alx as- asa asc ase asl ass asx ax- axa axe axl axs axx c-- caa cac cae cal cas cax cca ccc cce ccl ccs ccx ce- cea cec cee cel ces cex cl- cla clc cle cll cls clx csa csc cse csl css csx cxc cxl cxs cxx eaa eac eae eal eas eax ec- eca ecc ece ecl ecs ecx eea eec eee eel ees eex ela elc ele ell els elx es- esa esc ese esl ess esx ex- exa exc exe exl exs exx la- laa lac lae lal las lax lca lcc lce lcl lcs lcx lea lec lee lel les lex lla llc lle lll lls lsa lsc lse lsl lss lxc lxx saa sac sae sal sas sax sca scc sce scl scs scx se- sea sec see sel ses sex sla slc sle sll sls slx ss- ssa ssc sse ssl sss ssx sxc sxl sxs xaa xac xal xas xcl xcx xee xel xes xex xla xls xsa xsc xsl xss xxl xxx