-er -ic bbb bbc bbe bbi bbo bbr bbs bbx bcb bcc bce bci bco bcr bcs bcx be- beb bec bee bei beo ber bes bex bi- bib bic bie bii bio bir bis bix bob boc boe boi boo bor bos box brb bre bri bro brr brs brx bsb bsc bse bsi bso bsr bss bsx bxb bxi bxo bxx c-- cbb cbc cbe cbi cbo cbr cbs cbx ccb ccc cce cci cco ccr ccs ccx ce- ceb cec cee cei ceo cer ces cex ci- cib cic cie cii cio cir cis cix co- cob coc coe coi coo cor cos cox crb crc cre cri cro crr crs crx csb csc cse csi cso csr css csx cxc cxi cxo cxr cxs cxx ebb ebc ebe ebi ebo ebr ebs ebx ec- ecb ecc ece eci eco ecr ecs ecx eeb eec eee eeo eer ees eex eib eic eie eii eio eir eis eix eo- eob eoc eoe eoi eoo eor eos erb erc ere eri ero err ers es- esb esc ese esi eso esr ess esx ex- exc exe exi exo exr exs exx ibb ibc ibe ibi ibo ibr ibs ibx icb icc ice ici ico icr ics ie- iec iee iei ier ies iex iib iic iie iii iio iir iis iix io- iob ioc ioe ioi ioo ior ios ir- irb irc ire iri iro irr irs irx is- isb isc ise isi iso isr iss ixc ixe ixi o-i ob- obb obc obe obi obo obr obs obx oc- ocb occ oci oco ocr ocs ocx oeb oec oee oei oeo oer oes oex oib oic oie oii oio oir ois oo- oob ooc ooi ooo oor oos oox or- orb orc ore ori oro orr ors orx os- osb osc ose osi oso osr oss osx ox- oxb oxc oxi oxo oxx rbb rbc rbe rbi rbo rbr rbs rbx rcb rcc rce rci rco rcr rcs rcx re- reb rec ree rei reo rer res rex rib ric rie rii rio rir ris rix rob roc roe roi roo ror ros rox rrb rrc rri rrr rrs rsb rsc rse rsi rso rsr rss rsx rxr rxs sbb sbc sbe sbi sbo sbr sbs sbx scb scc sce sci sco scr scs scx se- seb sec see sei seo ser ses sex sib sic sie sii sio sir sis six sob soc soe soi soo sor sos sox sr- srb src sre sri sro srr srs srx ss- ssb ssc sse ssi sso ssr sss ssx sxc sxi sxs xbc xbe xbr xbx xcb xci xcr xcx xee xer xes xex xic xie xii xio xis xix xoc xoi xoo xor xos xox xrc xrx xsb xsc xsi xss xxi xxo xxx