-al a-a a-b a-c aaa aab aac aak aal aap ab- aba abb abc abk abl abp ac- aca acb acc ack acl acp aka akb akc akk akl akp al- ala alb alc alk all alp ap- apa apb apc apk apl app b-p baa bab bac bak bal bap bba bbb bbc bbk bbl bbp bca bcb bcc bck bcl bcp bka bkb bkc bkk bkl bkp bla blb blc blk bll blp bpa bpb bpc bpl bpp c-- caa cab cac cak cal cap cba cbb cbc cbk cbl cbp cca ccb ccc cck ccl ccp cka ckb ckc cl- cla clb clc clk cll clp cpa cpb cpc cpk cpl cpp ka- kaa kab kac kak kal kap kba kbb kbc kbk kbl kbp kca kcb kcc kck kcl kcp kkb kkc kkk kkl kkp kl- kla klb klc kpa kpc kpk kpl kpp l-p la- laa lab lac lak lal lap lba lbb lbc lbk lbl lbp lca lcb lcc lck lcl lcp lka lkb lkl lkp lla llb llc llk lll llp lpa lpb lpc lpk lpl lpp p-p paa pab pac pak pal pap pba pbb pbc pbk pbl pbp pca pcb pcc pck pcl pcp pka pkb pkc pkl pkp pla plb plc plk pll plp ppa ppb ppc ppk ppl ppp