-er b-p bbb bbc bbd bbe bbp bbr bbt bbx bcb bcc bcd bce bcp bcr bct bcx bdb bdc bdd bde bdp bdr bdt bdx be- beb bec bed bee bep ber bet bex bpb bpc bpd bpe bpp bpr bpt bpx brb brd bre brp brr brt brx btb btc btd bte btp btr btt btx bxb bxd bxx c-- cbb cbc cbd cbe cbp cbr cbt cbx ccb ccc ccd cce ccp ccr cct ccx cdb cdc cdd cde cdp cdr cdt cdx ce- ceb cec ced cee cep cer cet cex cpb cpc cpd cpe cpp cpr cpt cpx crb crc crd cre crp crr crt crx ctb ctc ctd cte ctp ctr ctt ctx cxc cxp cxr cxt cxx dbb dbc dbd dbe dbp dbr dbt dbx dcb dcc dcd dce dcp dcr dct dcx ddb ddc ddd dde ddp ddr ddt ddx de- deb dec ded dee dep der det dex dpb dpc dpd dpe dpp dpr dpt drb drc drd dre drp drr drt drx dtb dtc dtd dte dtp dtr dtt dtx dxc dxd dxp dxr dxt dxx ebb ebc ebd ebe ebp ebr ebt ebx ec- ecb ecc ecd ece ecr ect ecx ed- edb edc edd ede edp edr edt edx eeb eec eed eee eep eer eet eex ep- epb epc epd epe epp epr ept epx erb erc erd ere erp err ert etb etc etd ete etp etr ett etx ex- exc exd exe exp exr ext exx p-p pbb pbc pbd pbe pbp pbr pbt pbx pcb pcc pcd pce pcp pcr pct pcx pdb pdc pdd pde pdp pdr pdt pdx peb pec ped pee pep per pet pex ppb ppc ppd ppe ppp ppr ppt ppx prb prc prd pre prp prr prt prx pt- ptb ptc ptd pte ptp ptr ptt ptx pxc pxe pxr pxt rbb rbc rbd rbe rbp rbr rbt rbx rcb rcc rcd rce rcp rcr rct rcx rdb rdc rdd rde rdp rdr rdt rdx re- reb rec red ree rep rer ret rex rpb rpc rpd rpe rpp rpr rpt rpx rrb rrc rrd rrp rrr rrt rtb rtc rtd rte rtp rtr rtt rtx rxp rxr t-x tbb tbc tbd tbe tbp tbr tbt tcb tcc tcd tce tcp tcr tct tcx tdb tdc tdd tde tdp tdr tdt tdx te- teb tec ted tee tep ter tet tex tpb tpc tpd tpe tpp tpr tpt tpx trb trc trd tre trp trr trt trx ttb ttc ttd tte ttp ttr ttt ttx txe txt xbc xbe xbr xbx xcb xcd xcp xcr xcx xdb xdc xde xdr xdt xed xee xep xer xet xex xpb xpc xpd xpe xpp xpt xrc xrd xrt xrx xtc xtp xtr xtx xxp xxx