-er -ic b-p bbb bbc bbe bbf bbi bbo bbp bbr bbt bbx bcb bcc bce bcf bci bco bcp bcr bct bcx be- beb bec bee bef bei beo bep ber bet bex bfb bfc bfe bff bfi bfo bfp bfr bft bfx bi- bib bic bie bif bii bio bip bir bit bix bob boc boe bof boi boo bop bor bot box bpb bpc bpe bpf bpi bpo bpp bpr bpt bpx brb bre brf bri bro brp brr brt brx btb btc bte btf bti bto btp btr btt btx bxb bxi bxo bxx c-- cbb cbc cbe cbf cbi cbo cbp cbr cbt cbx ccb ccc cce ccf cci cco ccp ccr cct ccx ce- ceb cec cee cef cei ceo cep cer cet cex cfb cfc cfe cff cfi cfo cfp cfr cft cfx ci- cib cic cie cif cii cio cip cir cit cix co- cob coc coe cof coi coo cop cor cot cox cpb cpc cpe cpf cpi cpo cpp cpr cpt cpx crb crc cre crf cri cro crp crr crt crx ctb ctc cte ctf cti cto ctp ctr ctt ctx cxc cxf cxi cxo cxp cxr cxt cxx ebb ebc ebe ebf ebi ebo ebp ebr ebt ebx ec- ecb ecc ece ecf eci eco ecr ect ecx eeb eec eee eef eeo eep eer eet eex ef- efb efc efe eff efi efo efp efr eft efx eib eic eie eif eii eio eip eir eit eix eo- eob eoc eoe eof eoi eoo eop eor eot ep- epb epc epe epf epi epo epp epr ept epx erb erc ere erf eri ero erp err ert etb etc ete etf eti eto etp etr ett etx ex- exc exe exi exo exp exr ext exx fbb fbc fbe fbf fbi fbo fbp fbr fbt fbx fcb fcc fce fcf fci fco fcp fcr fct fcx feb fec fee fef fei feo fep fer fet fex ffc ffe fff ffi ffo ffp ffr fft ffx fib fic fie fif fii fip fir fit fix fob foc foe fof foi foo fop for fot fox fpb fpc fpe fpi fpo fpp fpr fpt fpx frb frc fre frf fri fro frp frr frt ftb ftc fte ftf fti fto ftp ftr ftt ftx fxe fxi fxp fxr fxt fxx i-f ibb ibc ibe ibf ibi ibo ibp ibr ibt ibx icb icc ice icf ici ico icp icr ict ie- iec iee ief iei iep ier iet iex ifb ifc ife iff ifi ifo ifp ifr ift ifx iib iic iie iif iii iio iip iir iit iix io- iob ioc ioe iof ioi ioo iop ior iot ipb ipc ipe ipf ipi ipo ipp ipr ipt ipx ir- irb irc ire irf iri iro irp irr irt irx itb itc ite itf iti ito itp itt itx ixc ixe ixi o-i ob- obb obc obe obf obi obo obp obr obt obx oc- ocb occ ocf oci oco ocp ocr oct ocx oeb oec oee oef oei oeo oep oer oet oex of- ofb ofc ofe off ofi ofo ofp ofr oft ofx oib oic oie oif oii oio oip oir oit oo- oob ooc oof ooi ooo oop oor oot oox op- opb opc ope opf opi opo opp opr opt opx or- orb orc ore orf ori oro orp orr ort orx ot- otb otc ote otf oti oto otp otr ott ox- oxb oxc oxf oxi oxo oxt oxx p-p pbb pbc pbe pbf pbi pbo pbp pbr pbt pbx pcb pcc pce pcf pci pco pcp pcr pct pcx peb pec pee pef pei peo pep per pet pex pfb pfc pfe pff pfi pfo pfp pfr pft pfx pib pic pie pif pii pio pip pir pit pix pob poc poe pof poi poo pop por pot pox ppb ppc ppe ppf ppi ppo ppp ppr ppt ppx prb prc pre prf pri pro prp prr prt prx pt- ptb ptc pte ptf pti pto ptp ptr ptt ptx pxc pxe pxr pxt rbb rbc rbe rbf rbi rbo rbp rbr rbt rbx rcb rcc rce rcf rci rco rcp rcr rct rcx re- reb rec ree ref rei reo rep rer ret rex rfb rfc rfe rff rfi rfo rfp rfr rft rib ric rie rif rii rio rip rir rit rix rob roc roe rof roi roo rop ror rot rox rpb rpc rpe rpf rpi rpo rpp rpr rpt rpx rrb rrc rrf rri rrp rrr rrt rtb rtc rte rtf rti rto rtp rtr rtt rtx rxp rxr t-x tbb tbc tbe tbf tbi tbo tbp tbr tbt tcb tcc tce tcf tci tco tcp tcr tct tcx te- teb tec tee tef tei teo tep ter tet tex tfb tfc tfe tff tfi tfo tfp tfr tft tfx tib tic tie tif tii tio tip tir tit tix to- tob toc toe tof toi too top tor tot tox tpb tpc tpe tpf tpi tpo tpp tpr tpt tpx trb trc tre trf tri tro trp trr trt trx ttb ttc tte ttf tti tto ttp ttr ttt ttx txe txf txi txt xbc xbe xbr xbx xcb xcf xci xcp xcr xcx xee xep xer xet xex xfe xft xfx xic xie xii xio xit xix xoc xof xoi xoo xop xor xot xox xpb xpc xpe xpf xpo xpp xpt xrc xrf xrt xrx xtc xtf xti xtp xtr xtx xxi xxo xxp xxx