b-p bbb bbc bbe bbl bbp bcb bcc bce bcl bcp be- beb bec bee bel bep blb blc ble bll blp bpb bpc bpe bpl bpp c-- cbb cbc cbe cbl cbp ccb ccc cce ccl ccp ce- ceb cec cee cel cep cl- clb clc cle cll clp cpb cpc cpe cpl cpp ebb ebc ebe ebl ebp ec- ecb ecc ece ecl eeb eec eee eel eep elb elc ele ell elp ep- epb epc epe epl epp l-p lbb lbc lbe lbl lbp lcb lcc lce lcl lcp leb lec lee lel lep llb llc lle lll llp lpb lpc lpe lpl lpp p-p pbb pbc pbe pbl pbp pcb pcc pce pcl pcp peb pec pee pel pep plb plc ple pll plp ppb ppc ppe ppl ppp