-er -ic bbb bbc bbe bbf bbi bbr bcb bcc bce bcf bci bcr be- beb bec bee bef bei ber bfb bfc bfe bff bfi bfr bi- bib bic bie bif bii bir brb bre brf bri brr c-- cbb cbc cbe cbf cbi cbr ccb ccc cce ccf cci ccr ce- ceb cec cee cef cei cer cfb cfc cfe cff cfi cfr ci- cib cic cie cif cii cir crb crc cre crf cri crr ebb ebc ebe ebf ebi ebr ec- ecb ecc ece ecf eci ecr eeb eec eee eef eer ef- efb efc efe eff efi efr eib eic eie eif eii eir erb erc ere erf eri err fbb fbc fbe fbf fbi fbr fcb fcc fce fcf fci fcr feb fec fee fef fei fer ffc ffe fff ffi ffr fib fic fie fif fii fir frb frc fre frf fri frr i-f ibb ibc ibe ibf ibi ibr icb icc ice icf ici icr ie- iec iee ief iei ier ifb ifc ife iff ifi ifr iib iic iie iif iii iir ir- irb irc ire irf iri irr rbb rbc rbe rbf rbi rbr rcb rcc rce rcf rci rcr re- reb rec ree ref rei rer rfb rfc rfe rff rfi rfr rib ric rie rif rii rir rrb rrc rrf rri rrr