-al a-a a-b a-c aaa aab aac aae aal aap ab- aba abb abc abe abl abp ac- aca acb acc ace acl acp aea aeb aec aee ael aep al- ala alb alc ale all alp ap- apa apb apc ape apl app b-p baa bab bac bae bal bap bba bbb bbc bbe bbl bbp bca bcb bcc bce bcl bcp be- bea beb bec bee bel bep bla blb blc ble bll blp bpa bpb bpc bpe bpl bpp c-- caa cab cac cae cal cap cba cbb cbc cbe cbl cbp cca ccb ccc cce ccl ccp ce- cea ceb cec cee cel cep cl- cla clb clc cle cll clp cpa cpb cpc cpe cpl cpp eaa eab eac eae eal eap eba ebb ebc ebe ebl ebp ec- eca ecb ecc ece ecl eea eeb eec eee eel eep ela elb elc ele ell elp ep- epa epb epc epe epl epp l-p la- laa lab lac lae lal lap lba lbb lbc lbe lbl lbp lca lcb lcc lce lcl lcp lea leb lec lee lel lep lla llb llc lle lll llp lpa lpb lpc lpe lpl lpp p-p paa pab pac pae pal pap pba pbb pbc pbe pbl pbp pca pcb pcc pce pcl pcp pea peb pec pee pel pep pla plb plc ple pll plp ppa ppb ppc ppe ppl ppp