-er -ic bbb bbc bbe bbf bbi bbo bbr bbt bcb bcc bce bcf bci bco bcr bct be- beb bec bee bef bei beo ber bet bfb bfc bfe bff bfi bfo bfr bft bi- bib bic bie bif bii bio bir bit bob boc boe bof boi boo bor bot brb bre brf bri bro brr brt btb btc bte btf bti bto btr btt c-- cbb cbc cbe cbf cbi cbo cbr cbt ccb ccc cce ccf cci cco ccr cct ce- ceb cec cee cef cei ceo cer cet cfb cfc cfe cff cfi cfo cfr cft ci- cib cic cie cif cii cio cir cit co- cob coc coe cof coi coo cor cot crb crc cre crf cri cro crr crt ctb ctc cte ctf cti cto ctr ctt ebb ebc ebe ebf ebi ebo ebr ebt ec- ecb ecc ece ecf eci eco ecr ect eeb eec eee eef eeo eer eet ef- efb efc efe eff efi efo efr eft eib eic eie eif eii eio eir eit eo- eob eoc eoe eof eoi eoo eor eot erb erc ere erf eri ero err ert etb etc ete etf eti eto etr ett fbb fbc fbe fbf fbi fbo fbr fbt fcb fcc fce fcf fci fco fcr fct feb fec fee fef fei feo fer fet ffc ffe fff ffi ffo ffr fft fib fic fie fif fii fir fit fob foc foe fof foi foo for fot frb frc fre frf fri fro frr frt ftb ftc fte ftf fti fto ftr ftt i-f ibb ibc ibe ibf ibi ibo ibr ibt icb icc ice icf ici ico icr ict ie- iec iee ief iei ier iet ifb ifc ife iff ifi ifo ifr ift iib iic iie iif iii iio iir iit io- iob ioc ioe iof ioi ioo ior iot ir- irb irc ire irf iri iro irr irt itb itc ite itf iti ito itt o-i ob- obb obc obe obf obi obo obr obt oc- ocb occ ocf oci oco ocr oct oeb oec oee oef oei oeo oer oet of- ofb ofc ofe off ofi ofo ofr oft oib oic oie oif oii oio oir oit oo- oob ooc oof ooi ooo oor oot or- orb orc ore orf ori oro orr ort ot- otb otc ote otf oti oto otr ott rbb rbc rbe rbf rbi rbo rbr rbt rcb rcc rce rcf rci rco rcr rct re- reb rec ree ref rei reo rer ret rfb rfc rfe rff rfi rfo rfr rft rib ric rie rif rii rio rir rit rob roc roe rof roi roo ror rot rrb rrc rrf rri rrr rrt rtb rtc rte rtf rti rto rtr rtt tbb tbc tbe tbf tbi tbo tbr tbt tcb tcc tce tcf tci tco tcr tct te- teb tec tee tef tei teo ter tet tfb tfc tfe tff tfi tfo tfr tft tib tic tie tif tii tio tir tit to- tob toc toe tof toi too tor tot trb trc tre trf tri tro trr trt ttb ttc tte ttf tti tto ttr ttt