-al a-a a-b a-c aaa aab aac aal aan aas ab- aba abb abc abl abn abs ac- aca acb acc acl acn acs al- ala alb alc all aln als an- ana anb anc anl ann ans as- asa asb asc asl asn ass baa bab bac bal ban bas bba bbb bbc bbl bbn bbs bca bcb bcc bcl bcn bcs bla blb blc bll bln bls bna bnb bnc bnl bnn bns bsa bsb bsc bsl bsn bss c-- caa cab cac cal can cas cba cbb cbc cbl cbn cbs cca ccb ccc ccl ccn ccs cl- cla clb clc cll cln cls cn- cna cnb cnc cnl cnn cns csa csb csc csl csn css la- laa lab lac lal lan las lba lbb lbc lbl lbs lca lcb lcc lcl lcn lcs lla llb llc lll lln lls lna lnb lnc lnl lnn lns lsa lsb lsc lsl lsn lss naa nab nac nal nan nas nba nbb nbc nbl nbn nbs nca ncb ncc ncl ncn ncs nla nlb nlc nll nln nls nna nnb nnc nnl nnn nns nsa nsb nsc nsl nsn nss saa sab sac sal san sas sba sbb sbc sbl sbn sbs sca scb scc scl scn scs sla slb slc sll sln sls sna snb snc snl snn sns ss- ssa ssb ssc ssl ssn sss