-er -ic bbb bbc bbe bbi bbo bbr bbt bcb bcc bce bci bco bcr bct be- beb bec bee bei beo ber bet bi- bib bic bie bii bio bir bit bob boc boe boi boo bor bot brb bre bri bro brr brt btb btc bte bti bto btr btt c-- cbb cbc cbe cbi cbo cbr cbt ccb ccc cce cci cco ccr cct ce- ceb cec cee cei ceo cer cet ci- cib cic cie cii cio cir cit co- cob coc coe coi coo cor cot crb crc cre cri cro crr crt ctb ctc cte cti cto ctr ctt ebb ebc ebe ebi ebo ebr ebt ec- ecb ecc ece eci eco ecr ect eeb eec eee eeo eer eet eib eic eie eii eio eir eit eo- eob eoc eoe eoi eoo eor eot erb erc ere eri ero err ert etb etc ete eti eto etr ett ibb ibc ibe ibi ibo ibr ibt icb icc ice ici ico icr ict ie- iec iee iei ier iet iib iic iie iii iio iir iit io- iob ioc ioe ioi ioo ior iot ir- irb irc ire iri iro irr irt itb itc ite iti ito itt o-i ob- obb obc obe obi obo obr obt oc- ocb occ oci oco ocr oct oeb oec oee oei oeo oer oet oib oic oie oii oio oir oit oo- oob ooc ooi ooo oor oot or- orb orc ore ori oro orr ort ot- otb otc ote oti oto otr ott rbb rbc rbe rbi rbo rbr rbt rcb rcc rce rci rco rcr rct re- reb rec ree rei reo rer ret rib ric rie rii rio rir rit rob roc roe roi roo ror rot rrb rrc rri rrr rrt rtb rtc rte rti rto rtr rtt tbb tbc tbe tbi tbo tbr tbt tcb tcc tce tci tco tcr tct te- teb tec tee tei teo ter tet tib tic tie tii tio tir tit to- tob toc toe toi too tor tot trb trc tre tri tro trr trt ttb ttc tte tti tto ttr ttt