-er -ic b-u bbb bbc bbe bbi bbo bbr bbu bcb bcc bce bci bco bcr bcu be- beb bec bee bei beo ber beu bi- bib bic bie bii bio bir biu bob boc boe boi boo bor bou brb bre bri bro brr bru bub buc bue bui buo bur buu c-- cbb cbc cbe cbi cbo cbr cbu ccb ccc cce cci cco ccr ccu ce- ceb cec cee cei ceo cer ceu ci- cib cic cie cii cio cir ciu co- cob coc coe coi coo cor cou crb crc cre cri cro crr cru cub cuc cue cui cuo cur cuu ebb ebc ebe ebi ebo ebr ebu ec- ecb ecc ece eci eco ecr ecu eeb eec eee eeo eer eib eic eie eii eio eir eiu eo- eob eoc eoe eoi eoo eor eou erb erc ere eri ero err eru eu- eub euc eue eui eur ibb ibc ibe ibi ibo ibr ibu icb icc ice ici ico icr icu ie- iec iee iei ier iib iic iie iii iio iir iiu io- iob ioc ioe ioi ioo ior iou ir- irb irc ire iri iro irr iru iu- iub iuc iue iui iur o-i ob- obb obc obe obi obo obr obu oc- ocb occ oci oco ocr ocu oeb oec oee oei oeo oer oib oic oie oii oio oir oiu oo- oob ooc ooi ooo oor or- orb orc ore ori oro orr oru ou- ouc oue oui ouo our rbb rbc rbe rbi rbo rbr rbu rcb rcc rce rci rco rcr rcu re- reb rec ree rei reo rer reu rib ric rie rii rio rir rob roc roe roi roo ror rou rrb rrc rri rrr rru rub ruc rue rui ruo rur ruu ubb ubc ube ubi ubo ubr ubu ucb ucc uce uci uco ucr ucu ueb uec uee uei uer uib uic uie uii uio uir uiu uob uoc uoe uoo uor ur- urb urc ure uri uro urr uru uuc uue uur uuu