-er -ic bbb bbc bbe bbi bbr bbs bbx bcb bcc bce bci bcr bcs bcx be- beb bec bee bei ber bes bex bi- bib bic bie bii bir bis bix brb bre bri brr brs brx bsb bsc bse bsi bsr bss bsx bxb bxi bxx c-- cbb cbc cbe cbi cbr cbs cbx ccb ccc cce cci ccr ccs ccx ce- ceb cec cee cei cer ces cex ci- cib cic cie cii cir cis cix crb crc cre cri crr crs crx csb csc cse csi csr css csx cxc cxi cxr cxs cxx ebb ebc ebe ebi ebr ebs ebx ec- ecb ecc ece eci ecr ecs ecx eeb eec eee eer ees eex eib eic eie eii eir eis eix erb erc ere eri err ers es- esb esc ese esi esr ess esx ex- exc exe exi exr exs exx ibb ibc ibe ibi ibr ibs ibx icb icc ice ici icr ics ie- iec iee iei ier ies iex iib iic iie iii iir iis iix ir- irb irc ire iri irr irs irx is- isb isc ise isi isr iss ixc ixe ixi rbb rbc rbe rbi rbr rbs rbx rcb rcc rce rci rcr rcs rcx re- reb rec ree rei rer res rex rib ric rie rii rir ris rix rrb rrc rri rrr rrs rsb rsc rse rsi rsr rss rsx rxr rxs sbb sbc sbe sbi sbr sbs sbx scb scc sce sci scr scs scx se- seb sec see sei ser ses sex sib sic sie sii sir sis six sr- srb src sre sri srr srs srx ss- ssb ssc sse ssi ssr sss ssx sxc sxi sxs xbc xbe xbr xbx xcb xci xcr xcx xee xer xes xex xic xie xii xis xix xrc xrx xsb xsc xsi xss xxi xxx