-al a-a a-b a-c aaa aab aac aal aar aas aax ab- aba abb abc abl abr abs abx ac- aca acb acc acl acr acs acx al- ala alb alc all alr als alx ar- ara arb arc arl arr ars arx as- asa asb asc asl asr ass asx ax- axa axl axr axs axx baa bab bac bal bar bas bax bba bbb bbc bbl bbr bbs bbx bca bcb bcc bcl bcr bcs bcx bla blb blc bll blr bls blx bra brb brl brr brs brx bsa bsb bsc bsl bsr bss bsx bxb bxl bxx c-- caa cab cac cal car cas cax cba cbb cbc cbl cbr cbs cbx cca ccb ccc ccl ccr ccs ccx cl- cla clb clc cll clr cls clx cra crb crc crl crr crs crx csa csb csc csl csr css csx cxc cxl cxr cxs cxx la- laa lab lac lal lar las lax lba lbb lbc lbl lbr lbs lbx lca lcb lcc lcl lcr lcs lcx lla llb llc lll llr lls lra lrb lrc lrr lrs lsa lsb lsc lsl lsr lss lxc lxr lxx ra- raa rab rac ral rar ras rax rba rbb rbc rbl rbr rbs rbx rca rcb rcc rcl rcr rcs rcx rla rlc rll rlr rls rra rrb rrc rrl rrr rrs rsa rsb rsc rsl rsr rss rsx rxr rxs saa sab sac sal sar sas sax sba sbb sbc sbl sbr sbs sbx sca scb scc scl scr scs scx sla slb slc sll slr sls slx sr- sra srb src srl srr srs srx ss- ssa ssb ssc ssl ssr sss ssx sxc sxl sxs xaa xac xal xar xas xbc xbl xbr xbx xcb xcl xcr xcx xla xlb xlr xls xrc xrx xsa xsb xsc xsl xss xxl xxx