-er -ic bbb bbc bbe bbi bbr bbs bbt bbx bcb bcc bce bci bcr bcs bct bcx be- beb bec bee bei ber bes bet bex bi- bib bic bie bii bir bis bit bix brb bre bri brr brs brt brx bsb bsc bse bsi bsr bss bst bsx btb btc bte bti btr bts btt btx bxb bxi bxx c-- cbb cbc cbe cbi cbr cbs cbt cbx ccb ccc cce cci ccr ccs cct ccx ce- ceb cec cee cei cer ces cet cex ci- cib cic cie cii cir cis cit cix crb crc cre cri crr crs crt crx csb csc cse csi csr css cst csx ctb ctc cte cti ctr cts ctt ctx cxc cxi cxr cxs cxt cxx ebb ebc ebe ebi ebr ebs ebt ebx ec- ecb ecc ece eci ecr ecs ect ecx eeb eec eee eer ees eet eex eib eic eie eii eir eis eit eix erb erc ere eri err ers ert es- esb esc ese esi esr ess est esx etb etc ete eti etr ets ett etx ex- exc exe exi exr exs ext exx ibb ibc ibe ibi ibr ibs ibt ibx icb icc ice ici icr ics ict ie- iec iee iei ier ies iet iex iib iic iie iii iir iis iit iix ir- irb irc ire iri irr irs irt irx is- isb isc ise isi isr iss ist itb itc ite iti its itt itx ixc ixe ixi rbb rbc rbe rbi rbr rbs rbt rbx rcb rcc rce rci rcr rcs rct rcx re- reb rec ree rei rer res ret rex rib ric rie rii rir ris rit rix rrb rrc rri rrr rrs rrt rsb rsc rse rsi rsr rss rst rsx rtb rtc rte rti rtr rts rtt rtx rxr rxs sbb sbc sbe sbi sbr sbs sbt sbx scb scc sce sci scr scs sct scx se- seb sec see sei ser ses set sex sib sic sie sii sir sis sit six sr- srb src sre sri srr srs srt srx ss- ssb ssc sse ssi ssr sss sst ssx stb stc ste sti str sts stt stx sxc sxi sxs sxt t-x tbb tbc tbe tbi tbr tbs tbt tcb tcc tce tci tcr tcs tct tcx te- teb tec tee tei ter tes tet tex tib tic tie tii tir tis tit tix trb trc tre tri trr trs trt trx tsb tsc tse tsi tsr tss tst tsx ttb ttc tte tti ttr tts ttt ttx txe txi txs txt xbc xbe xbr xbx xcb xci xcr xcx xee xer xes xet xex xic xie xii xis xit xix xrc xrt xrx xsb xsc xsi xss xst xtc xti xtr xts xtx xxi xxx