-al a-a a-b a-c aaa aab aac aal aap ab- aba abb abc abl abp ac- aca acb acc acl acp al- ala alb alc all alp ap- apa apb apc apl app b-p baa bab bac bal bap bba bbb bbc bbl bbp bca bcb bcc bcl bcp bla blb blc bll blp bpa bpb bpc bpl bpp c-- caa cab cac cal cap cba cbb cbc cbl cbp cca ccb ccc ccl ccp cl- cla clb clc cll clp cpa cpb cpc cpl cpp l-p la- laa lab lac lal lap lba lbb lbc lbl lbp lca lcb lcc lcl lcp lla llb llc lll llp lpa lpb lpc lpl lpp p-p paa pab pac pal pap pba pbb pbc pbl pbp pca pcb pcc pcl pcp pla plb plc pll plp ppa ppb ppc ppl ppp