-er -ic b-u bbb bbc bbe bbf bbi bbr bbu bcb bcc bce bcf bci bcr bcu be- beb bec bee bef bei ber beu bfb bfc bfe bff bfi bfr bfu bi- bib bic bie bif bii bir biu brb bre brf bri brr bru bub buc bue buf bui bur buu c-- cbb cbc cbe cbf cbi cbr cbu ccb ccc cce ccf cci ccr ccu ce- ceb cec cee cef cei cer ceu cfb cfc cfe cff cfi cfr cfu ci- cib cic cie cif cii cir ciu crb crc cre crf cri crr cru cub cuc cue cuf cui cur cuu ebb ebc ebe ebf ebi ebr ebu ec- ecb ecc ece ecf eci ecr ecu eeb eec eee eef eer ef- efb efc efe eff efi efr eib eic eie eif eii eir eiu erb erc ere erf eri err eru eu- eub euc eue euf eui eur fbb fbc fbe fbf fbi fbr fbu fcb fcc fce fcf fci fcr fcu feb fec fee fef fei fer feu ffc ffe fff ffi ffr ffu fib fic fie fif fii fir fiu frb frc fre frf fri frr fru fub fue fuf fui fur fuu i-f ibb ibc ibe ibf ibi ibr ibu icb icc ice icf ici icr icu ie- iec iee ief iei ier ifb ifc ife iff ifi ifr ifu iib iic iie iif iii iir iiu ir- irb irc ire irf iri irr iru iu- iub iuc iue iui iur rbb rbc rbe rbf rbi rbr rbu rcb rcc rce rcf rci rcr rcu re- reb rec ree ref rei rer reu rfb rfc rfe rff rfi rfr rfu rib ric rie rif rii rir rrb rrc rrf rri rrr rru rub ruc rue ruf rui rur ruu ubb ubc ube ubf ubi ubr ubu ucb ucc uce ucf uci ucr ucu ueb uec uee uef uei uer ufc ufe uff ufi ufr ufu uib uic uie uif uii uir uiu ur- urb urc ure urf uri urr uru uuc uue uur uuu