-er -ic bbb bbc bbe bbi bbn bbr bbs bbt bbx bcb bcc bce bci bcn bcr bcs bct bcx be- beb bec bee bei ben ber bes bet bex bi- bib bic bie bii bin bir bis bit bix bnb bnc bne bni bnn bnr bns bnt bnx brb bre bri brn brr brs brt brx bsb bsc bse bsi bsn bsr bss bst bsx btb btc bte bti btn btr bts btt btx bxb bxi bxn bxx c-- cbb cbc cbe cbi cbn cbr cbs cbt cbx ccb ccc cce cci ccn ccr ccs cct ccx ce- ceb cec cee cei cen cer ces cet cex ci- cib cic cie cii cin cir cis cit cix cn- cnb cnc cne cni cnn cnr cns cnt cnx crb crc cre cri crn crr crs crt crx csb csc cse csi csn csr css cst csx ctb ctc cte cti ctn ctr cts ctt ctx cxc cxi cxr cxs cxt cxx ebb ebc ebe ebi ebn ebr ebs ebt ebx ec- ecb ecc ece eci ecn ecr ecs ect ecx eeb eec eee een eer ees eet eex eib eic eie eii ein eir eis eit eix en- enb enc ene eni enn enr ens ent erb erc ere eri ern err ers ert es- esb esc ese esi esn esr ess est esx etb etc ete eti etn etr ets ett etx ex- exc exe exi exr exs ext exx ibb ibc ibe ibi ibn ibr ibs ibt ibx icb icc ice ici icn icr ics ict ie- iec iee iei ien ier ies iet iex iib iic iie iii iin iir iis iit iix in- inb inc ine ini inn inr ins int inx ir- irb irc ire iri irn irr irs irt irx is- isb isc ise isi isn isr iss ist itb itc ite iti itn its itt itx ixc ixe ixi ixn n-i nbb nbc nbe nbi nbn nbr nbs nbt nbx ncb ncc nce nci ncn ncr ncs nct ncx ne- neb nec nee nei nen ner nes net nex nib nic nie nii nin nir nis nit nix nnb nnc nne nni nnn nns nnt nrb nrc nre nri nrn nrr nrs nrt nrx nsb nsc nse nsi nsn nsr nss nst nsx ntb ntc nte nti ntn ntr nts ntt ntx nxc nxt rbb rbc rbe rbi rbn rbr rbs rbt rbx rcb rcc rce rci rcn rcr rcs rct rcx re- reb rec ree rei ren rer res ret rex rib ric rie rii rin rir ris rit rix rnb rnc rni rnn rnr rns rnt rrb rrc rri rrn rrr rrs rrt rsb rsc rse rsi rsn rsr rss rst rsx rtb rtc rte rti rtn rtr rts rtt rtx rxr rxs sbb sbc sbe sbi sbn sbr sbs sbt sbx scb scc sce sci scn scr scs sct scx se- seb sec see sei sen ser ses set sex sib sic sie sii sin sir sis sit six snb snc sne sni snn snr sns snt sr- srb src sre sri srn srr srs srt srx ss- ssb ssc sse ssi ssn ssr sss sst ssx stb stc ste sti stn str sts stt stx sxc sxi sxn sxs sxt t-x tbb tbc tbe tbi tbn tbr tbs tbt tcb tcc tce tci tcn tcr tcs tct tcx te- teb tec tee tei ten ter tes tet tex tib tic tie tii tin tir tis tit tix tnb tnc tne tni tnn tnr tns tnt tnx trb trc tre tri trn trr trs trt trx tsb tsc tse tsi tsn tsr tss tst tsx ttb ttc tte tti ttn ttr tts ttt ttx txe txi txn txs txt xbc xbe xbr xbx xcb xci xcr xcx xee xen xer xes xet xex xic xie xii xin xis xit xix xnc xns xrc xrt xrx xsb xsc xsi xss xst xtc xti xtr xts xtx xxi xxx