-er -ic bbb bbc bbe bbi bbo bbr bbs bbt bcb bcc bce bci bco bcr bcs bct be- beb bec bee bei beo ber bes bet bi- bib bic bie bii bio bir bis bit bob boc boe boi boo bor bos bot brb bre bri bro brr brs brt bsb bsc bse bsi bso bsr bss bst btb btc bte bti bto btr bts btt c-- cbb cbc cbe cbi cbo cbr cbs cbt ccb ccc cce cci cco ccr ccs cct ce- ceb cec cee cei ceo cer ces cet ci- cib cic cie cii cio cir cis cit co- cob coc coe coi coo cor cos cot crb crc cre cri cro crr crs crt csb csc cse csi cso csr css cst ctb ctc cte cti cto ctr cts ctt ebb ebc ebe ebi ebo ebr ebs ebt ec- ecb ecc ece eci eco ecr ecs ect eeb eec eee eeo eer ees eet eib eic eie eii eio eir eis eit eo- eob eoc eoe eoi eoo eor eos eot erb erc ere eri ero err ers ert es- esb esc ese esi eso esr ess est etb etc ete eti eto etr ets ett ibb ibc ibe ibi ibo ibr ibs ibt icb icc ice ici ico icr ics ict ie- iec iee iei ier ies iet iib iic iie iii iio iir iis iit io- iob ioc ioe ioi ioo ior ios iot ir- irb irc ire iri iro irr irs irt is- isb isc ise isi iso isr iss ist itb itc ite iti ito its itt o-i ob- obb obc obe obi obo obr obs obt oc- ocb occ oci oco ocr ocs oct oeb oec oee oei oeo oer oes oet oib oic oie oii oio oir ois oit oo- oob ooc ooi ooo oor oos oot or- orb orc ore ori oro orr ors ort os- osb osc ose osi oso osr oss ost ot- otb otc ote oti oto otr ots ott rbb rbc rbe rbi rbo rbr rbs rbt rcb rcc rce rci rco rcr rcs rct re- reb rec ree rei reo rer res ret rib ric rie rii rio rir ris rit rob roc roe roi roo ror ros rot rrb rrc rri rrr rrs rrt rsb rsc rse rsi rso rsr rss rst rtb rtc rte rti rto rtr rts rtt sbb sbc sbe sbi sbo sbr sbs sbt scb scc sce sci sco scr scs sct se- seb sec see sei seo ser ses set sib sic sie sii sio sir sis sit sob soc soe soi soo sor sos sot sr- srb src sre sri sro srr srs srt ss- ssb ssc sse ssi sso ssr sss sst stb stc ste sti sto str sts stt tbb tbc tbe tbi tbo tbr tbs tbt tcb tcc tce tci tco tcr tcs tct te- teb tec tee tei teo ter tes tet tib tic tie tii tio tir tis tit to- tob toc toe toi too tor tos tot trb trc tre tri tro trr trs trt tsb tsc tse tsi tso tsr tss tst ttb ttc tte tti tto ttr tts ttt