-al a-a a-b a-c aaa aab aac aae aal aas aau aax ab- aba abb abc abe abl abs abu abx ac- aca acb acc ace acl acs acu acx aea aeb aec aee ael aes aeu aex al- ala alb alc ale all als alu alx as- asa asb asc ase asl ass asu asx au- aua aub auc aue aul aus aux ax- axa axe axl axs axx b-u baa bab bac bae bal bas bau bax bba bbb bbc bbe bbl bbs bbu bbx bca bcb bcc bce bcl bcs bcu bcx be- bea beb bec bee bel bes beu bex bla blb blc ble bll bls blu blx bsa bsb bsc bse bsl bss bsu bsx bua bub buc bue bul bus buu bux bxb bxl bxx c-- caa cab cac cae cal cas cau cax cba cbb cbc cbe cbl cbs cbu cbx cca ccb ccc cce ccl ccs ccu ccx ce- cea ceb cec cee cel ces ceu cex cl- cla clb clc cle cll cls clu clx csa csb csc cse csl css csu csx cua cub cuc cue cul cus cuu cxc cxl cxs cxx eaa eab eac eae eal eas eau eax eba ebb ebc ebe ebl ebs ebu ebx ec- eca ecb ecc ece ecl ecs ecu ecx eea eeb eec eee eel ees eex ela elb elc ele ell els elu elx es- esa esb esc ese esl ess esu esx eu- eua eub euc eue eul eus eux ex- exa exc exe exl exs exu exx la- laa lab lac lae lal las lau lax lba lbb lbc lbe lbl lbs lbu lbx lca lcb lcc lce lcl lcs lcu lcx lea leb lec lee lel les leu lex lla llb llc lle lll lls llu lsa lsb lsc lse lsl lss lsu lua lub luc lue lul lus luu lux lxc lxx saa sab sac sae sal sas sau sax sba sbb sbc sbe sbl sbs sbu sbx sca scb scc sce scl scs scu scx se- sea seb sec see sel ses seu sex sla slb slc sle sll sls slu slx ss- ssa ssb ssc sse ssl sss ssu ssx sua sub suc sue sul sus suu sux sxc sxl sxs sxu ua- uaa uab uac uae ual uas uau uba ubb ubc ube ubl ubs ubu ubx uca ucb ucc uce ucl ucs ucu uea ueb uec uee uel ues ula ulb ulc ule ull uls ulu usa usb usc use usl uss usu usx uua uuc uue uus uuu uxb uxc uxu xaa xac xal xas xau xbc xbe xbl xbx xcb xcl xcx xee xel xes xeu xex xla xlb xls xsa xsb xsc xsl xss xue xul xus xxl xxx