-al a-a a-b a-c aaa aab aac aak aal aan aap ab- aba abb abc abk abl abn abp ac- aca acb acc ack acl acn acp aka akb akc akk akl akn akp al- ala alb alc alk all aln alp an- ana anb anc ank anl ann anp ap- apa apb apc apk apl apn app b-p baa bab bac bak bal ban bap bba bbb bbc bbk bbl bbn bbp bca bcb bcc bck bcl bcn bcp bka bkb bkc bkk bkl bkn bkp bla blb blc blk bll bln blp bna bnb bnc bnk bnl bnn bnp bpa bpb bpc bpl bpn bpp c-- caa cab cac cak cal can cap cba cbb cbc cbk cbl cbn cbp cca ccb ccc cck ccl ccn ccp cka ckb ckc cl- cla clb clc clk cll cln clp cn- cna cnb cnc cnl cnn cnp cpa cpb cpc cpk cpl cpn cpp ka- kaa kab kac kak kal kan kap kba kbb kbc kbk kbl kbn kbp kca kcb kcc kck kcl kcn kcp kkb kkc kkk kkl kkn kkp kl- kla klb klc kn- kna knc knk knl knn knp kpa kpc kpk kpl kpn kpp l-p la- laa lab lac lak lal lan lap lba lbb lbc lbk lbl lbp lca lcb lcc lck lcl lcn lcp lka lkb lkl lkp lla llb llc llk lll lln llp lna lnb lnc lnk lnl lnn lnp lpa lpb lpc lpk lpl lpn lpp naa nab nac nak nal nan nap nba nbb nbc nbk nbl nbn nbp nca ncb ncc nck ncl ncn ncp nka nkc nkk nkn nkp nla nlb nlc nlk nll nln nlp nna nnb nnc nnk nnl nnn nnp npa npb npc npl npn npp p-p paa pab pac pak pal pan pap pba pbb pbc pbk pbl pbn pbp pca pcb pcc pck pcl pcn pcp pka pkb pkc pkl pkn pkp pla plb plc plk pll pln plp pn- pna pnb pnc pnk pnl pnn pnp ppa ppb ppc ppk ppl ppn ppp