-al a-a a-b a-c aaa aab aac aae aal aan aap aas ab- aba abb abc abe abl abn abp abs ac- aca acb acc ace acl acn acp acs aea aeb aec aee ael aen aep aes al- ala alb alc ale all aln alp als an- ana anb anc ane anl ann anp ans ap- apa apb apc ape apl apn app aps as- asa asb asc ase asl asn asp ass b-p baa bab bac bae bal ban bap bas bba bbb bbc bbe bbl bbn bbp bbs bca bcb bcc bce bcl bcn bcp bcs be- bea beb bec bee bel ben bep bes bla blb blc ble bll bln blp bls bna bnb bnc bne bnl bnn bnp bns bpa bpb bpc bpe bpl bpn bpp bps bsa bsb bsc bse bsl bsn bsp bss c-- caa cab cac cae cal can cap cas cba cbb cbc cbe cbl cbn cbp cbs cca ccb ccc cce ccl ccn ccp ccs ce- cea ceb cec cee cel cen cep ces cl- cla clb clc cle cll cln clp cls cn- cna cnb cnc cne cnl cnn cnp cns cpa cpb cpc cpe cpl cpn cpp cps csa csb csc cse csl csn csp css eaa eab eac eae eal ean eap eas eba ebb ebc ebe ebl ebn ebp ebs ec- eca ecb ecc ece ecl ecn ecs eea eeb eec eee eel een eep ees ela elb elc ele ell eln elp els en- ena enb enc ene enl enn enp ens ep- epa epb epc epe epl epn epp eps es- esa esb esc ese esl esn esp ess l-p la- laa lab lac lae lal lan lap las lba lbb lbc lbe lbl lbp lbs lca lcb lcc lce lcl lcn lcp lcs lea leb lec lee lel len lep les lla llb llc lle lll lln llp lls lna lnb lnc lne lnl lnn lnp lns lpa lpb lpc lpe lpl lpn lpp lps lsa lsb lsc lse lsl lsn lsp lss naa nab nac nae nal nan nap nas nba nbb nbc nbe nbl nbn nbp nbs nca ncb ncc nce ncl ncn ncp ncs ne- nea neb nec nee nel nen nep nes nla nlb nlc nle nll nln nlp nls nna nnb nnc nne nnl nnn nnp nns npa npb npc npe npl npn npp nps nsa nsb nsc nse nsl nsn nsp nss p-p paa pab pac pae pal pan pap pas pba pbb pbc pbe pbl pbn pbp pbs pca pcb pcc pce pcl pcn pcp pcs pea peb pec pee pel pen pep pes pla plb plc ple pll pln plp pls pn- pna pnb pnc pne pnl pnn pnp pns ppa ppb ppc ppe ppl ppn ppp pps ps- psa psb psc pse psl psn psp pss saa sab sac sae sal san sap sas sba sbb sbc sbe sbl sbn sbp sbs sca scb scc sce scl scn scp scs se- sea seb sec see sel sen sep ses sla slb slc sle sll sln slp sls sna snb snc sne snl snn snp sns spa spb spc spe spl spn spp sps ss- ssa ssb ssc sse ssl ssn ssp sss