-er b-p bbb bbc bbe bbl bbp bbr bcb bcc bce bcl bcp bcr be- beb bec bee bel bep ber blb blc ble bll blp blr bpb bpc bpe bpl bpp bpr brb bre brl brp brr c-- cbb cbc cbe cbl cbp cbr ccb ccc cce ccl ccp ccr ce- ceb cec cee cel cep cer cl- clb clc cle cll clp clr cpb cpc cpe cpl cpp cpr crb crc cre crl crp crr ebb ebc ebe ebl ebp ebr ec- ecb ecc ece ecl ecr eeb eec eee eel eep eer elb elc ele ell elp elr ep- epb epc epe epl epp epr erb erc ere erl erp err l-p lbb lbc lbe lbl lbp lbr lcb lcc lce lcl lcp lcr leb lec lee lel lep ler llb llc lle lll llp llr lpb lpc lpe lpl lpp lpr lrb lrc lrp lrr p-p pbb pbc pbe pbl pbp pbr pcb pcc pce pcl pcp pcr peb pec pee pel pep per plb plc ple pll plp plr ppb ppc ppe ppl ppp ppr prb prc pre prl prp prr rbb rbc rbe rbl rbp rbr rcb rcc rce rcl rcp rcr re- reb rec ree rel rep rer rlc rle rll rlp rlr rpb rpc rpe rpl rpp rpr rrb rrc rrl rrp rrr