-er -ic bbb bbc bbe bbi bbr bbt bcb bcc bce bci bcr bct bcz be- beb bec bee bei ber bet bez bi- bib bic bie bii bir bit biz brb bre bri brr brt brz btb btc bte bti btr btt btz bze bzr bzz c-- cbb cbc cbe cbi cbr cbt cbz ccb ccc cce cci ccr cct ccz ce- ceb cec cee cei cer cet cez ci- cib cic cie cii cir cit crb crc cre cri crr crt crz ctb ctc cte cti ctr ctt ctz cz- czc cze czt ebb ebc ebe ebi ebr ebt ec- ecb ecc ece eci ecr ect eeb eec eee eer eet eib eic eie eii eir eit erb erc ere eri err ert erz etb etc ete eti etr ett etz eze ezr ezz ibb ibc ibe ibi ibr ibt ibz icb icc ice ici icr ict icz ie- iec iee iei ier iet iib iic iie iii iir iit ir- irb irc ire iri irr irt itb itc ite iti itt itz ize izi izz rbb rbc rbe rbi rbr rbt rcb rcc rce rci rcr rct re- reb rec ree rei rer ret rez rib ric rie rii rir rit riz rrb rrc rri rrr rrt rtb rtc rte rti rtr rtt rtz rzb rze tbb tbc tbe tbi tbr tbt tbz tcb tcc tce tci tcr tct te- teb tec tee tei ter tet tez tib tic tie tii tir tit tiz trb trc tre tri trr trt trz ttb ttc tte tti ttr ttt tze zbb zbc zbr zbt zce zeb zec zee zer zet zez zib zie zir zit ziz zte ztr zzr zzt zzz