-er b-p bbb bbc bbe bbf bbl bbp bbr bbt bcb bcc bce bcf bcl bcp bcr bct be- beb bec bee bef bel bep ber bet bfb bfc bfe bff bfl bfp bfr bft blb blc ble blf bll blp blr blt bpb bpc bpe bpf bpl bpp bpr bpt brb bre brf brl brp brr brt btb btc bte btf btl btp btr btt c-- cbb cbc cbe cbf cbl cbp cbr cbt ccb ccc cce ccf ccl ccp ccr cct ce- ceb cec cee cef cel cep cer cet cfb cfc cfe cff cfl cfp cfr cft cl- clb clc cle clf cll clp clr clt cpb cpc cpe cpf cpl cpp cpr cpt crb crc cre crf crl crp crr crt ctb ctc cte ctf ctl ctp ctr ctt ebb ebc ebe ebf ebl ebp ebr ebt ec- ecb ecc ece ecf ecl ecr ect eeb eec eee eef eel eep eer eet ef- efb efc efe eff efl efp efr eft elb elc ele elf ell elp elr elt ep- epb epc epe epf epl epp epr ept erb erc ere erf erl erp err ert etb etc ete etf etl etp etr ett fbb fbc fbe fbf fbl fbp fbr fbt fcb fcc fce fcf fcl fcp fcr fct feb fec fee fef fel fep fer fet ffc ffe fff ffl ffp ffr fft flb flc fle flf fll flp flr flt fpb fpc fpe fpl fpp fpr fpt frb frc fre frf frl frp frr frt ftb ftc fte ftf ftl ftp ftr ftt l-p lbb lbc lbe lbf lbl lbp lbr lbt lcb lcc lce lcf lcl lcp lcr lct leb lec lee lef lel lep ler let lfb lfc lfe lff lfl lfp lfr lft llb llc lle llf lll llp llr llt lpb lpc lpe lpf lpl lpp lpr lpt lrb lrc lrf lrp lrr lrt ltb ltc lte ltf ltl ltp ltr ltt p-p pbb pbc pbe pbf pbl pbp pbr pbt pcb pcc pce pcf pcl pcp pcr pct peb pec pee pef pel pep per pet pfb pfc pfe pff pfl pfp pfr pft plb plc ple plf pll plp plr plt ppb ppc ppe ppf ppl ppp ppr ppt prb prc pre prf prl prp prr prt pt- ptb ptc pte ptf ptl ptp ptr ptt rbb rbc rbe rbf rbl rbp rbr rbt rcb rcc rce rcf rcl rcp rcr rct re- reb rec ree ref rel rep rer ret rfb rfc rfe rff rfl rfp rfr rft rlc rle rlf rll rlp rlr rlt rpb rpc rpe rpf rpl rpp rpr rpt rrb rrc rrf rrl rrp rrr rrt rtb rtc rte rtf rtl rtp rtr rtt tbb tbc tbe tbf tbl tbp tbr tbt tcb tcc tce tcf tcl tcp tcr tct te- teb tec tee tef tel tep ter tet tfb tfc tfe tff tfl tfp tfr tft tlc tle tlf tll tlp tlr tlt tpb tpc tpe tpf tpl tpp tpr tpt trb trc tre trf trl trp trr trt ttb ttc tte ttf ttl ttp ttr ttt