-al a-a a-b a-c aaa aab aac aae aak aal aan aap ab- aba abb abc abe abk abl abn abp ac- aca acb acc ace ack acl acn acp aea aeb aec aee aek ael aen aep aka akb akc ake akk akl akn akp al- ala alb alc ale alk all aln alp an- ana anb anc ane ank anl ann anp ap- apa apb apc ape apk apl apn app b-p baa bab bac bae bak bal ban bap bba bbb bbc bbe bbk bbl bbn bbp bca bcb bcc bce bck bcl bcn bcp be- bea beb bec bee bek bel ben bep bka bkb bkc bke bkk bkl bkn bkp bla blb blc ble blk bll bln blp bna bnb bnc bne bnk bnl bnn bnp bpa bpb bpc bpe bpl bpn bpp c-- caa cab cac cae cak cal can cap cba cbb cbc cbe cbk cbl cbn cbp cca ccb ccc cce cck ccl ccn ccp ce- cea ceb cec cee cek cel cen cep cka ckb ckc cl- cla clb clc cle clk cll cln clp cn- cna cnb cnc cne cnl cnn cnp cpa cpb cpc cpe cpk cpl cpn cpp eaa eab eac eae eak eal ean eap eba ebb ebc ebe ebk ebl ebn ebp ec- eca ecb ecc ece eck ecl ecn eea eeb eec eee eek eel een eep eka ekb ekc eke ekl ekp ela elb elc ele elk ell eln elp en- ena enb enc ene enk enl enn enp ep- epa epb epc epe epl epn epp ka- kaa kab kac kae kak kal kan kap kba kbb kbc kbe kbk kbl kbn kbp kca kcb kcc kce kck kcl kcn kcp ke- kea keb kec kee kek kel ken kep kkb kkc kke kkk kkl kkn kkp kl- kla klb klc kn- kna knc kne knk knl knn knp kpa kpc kpe kpk kpl kpn kpp l-p la- laa lab lac lae lak lal lan lap lba lbb lbc lbe lbk lbl lbp lca lcb lcc lce lck lcl lcn lcp lea leb lec lee lek lel len lep lka lkb lkl lkp lla llb llc lle llk lll lln llp lna lnb lnc lne lnk lnl lnn lnp lpa lpb lpc lpe lpk lpl lpn lpp naa nab nac nae nak nal nan nap nba nbb nbc nbe nbk nbl nbn nbp nca ncb ncc nce nck ncl ncn ncp ne- nea neb nec nee nek nel nen nep nka nkc nke nkk nkn nkp nla nlb nlc nle nlk nll nln nlp nna nnb nnc nne nnk nnl nnn nnp npa npb npc npe npl npn npp p-p paa pab pac pae pak pal pan pap pba pbb pbc pbe pbk pbl pbn pbp pca pcb pcc pce pck pcl pcn pcp pea peb pec pee pek pel pen pep pka pkb pkc pke pkl pkn pkp pla plb plc ple plk pll pln plp pn- pna pnb pnc pne pnk pnl pnn pnp ppa ppb ppc ppe ppk ppl ppn ppp