-al a-a a-b a-c aaa aab aac aae aal aan aap ab- aba abb abc abe abl abn abp ac- aca acb acc ace acl acn acp aea aeb aec aee ael aen aep al- ala alb alc ale all aln alp an- ana anb anc ane anl ann anp ap- apa apb apc ape apl apn app b-p baa bab bac bae bal ban bap bba bbb bbc bbe bbl bbn bbp bca bcb bcc bce bcl bcn bcp be- bea beb bec bee bel ben bep bla blb blc ble bll bln blp bna bnb bnc bne bnl bnn bnp bpa bpb bpc bpe bpl bpn bpp c-- caa cab cac cae cal can cap cba cbb cbc cbe cbl cbn cbp cca ccb ccc cce ccl ccn ccp ce- cea ceb cec cee cel cen cep cl- cla clb clc cle cll cln clp cn- cna cnb cnc cne cnl cnn cnp cpa cpb cpc cpe cpl cpn cpp eaa eab eac eae eal ean eap eba ebb ebc ebe ebl ebn ebp ec- eca ecb ecc ece ecl ecn eea eeb eec eee eel een eep ela elb elc ele ell eln elp en- ena enb enc ene enl enn enp ep- epa epb epc epe epl epn epp l-p la- laa lab lac lae lal lan lap lba lbb lbc lbe lbl lbp lca lcb lcc lce lcl lcn lcp lea leb lec lee lel len lep lla llb llc lle lll lln llp lna lnb lnc lne lnl lnn lnp lpa lpb lpc lpe lpl lpn lpp naa nab nac nae nal nan nap nba nbb nbc nbe nbl nbn nbp nca ncb ncc nce ncl ncn ncp ne- nea neb nec nee nel nen nep nla nlb nlc nle nll nln nlp nna nnb nnc nne nnl nnn nnp npa npb npc npe npl npn npp p-p paa pab pac pae pal pan pap pba pbb pbc pbe pbl pbn pbp pca pcb pcc pce pcl pcn pcp pea peb pec pee pel pen pep pla plb plc ple pll pln plp pn- pna pnb pnc pne pnl pnn pnp ppa ppb ppc ppe ppl ppn ppp