-er -ic bbb bbc bbe bbi bbr bcb bcc bce bci bcr bcv be- beb bec bee bei ber bev bi- bib bic bie bii bir biv brb bre bri brr brv bvb bvc bve bvi bvr bvv c-- cbb cbc cbe cbi cbr cbv ccb ccc cce cci ccr ccv ce- ceb cec cee cei cer cev ci- cib cic cie cii cir civ crb crc cre cri crr crv cvb cvc cve cvi cvr cvv ebb ebc ebe ebi ebr ebv ec- ecb ecc ece eci ecr ecv eeb eec eee eer eev eib eic eie eii eir eiv erb erc ere eri err erv evb evc eve evi evr evv i-v ibb ibc ibe ibi ibr ibv icb icc ice ici icr icv ie- iec iee iei ier iev iib iic iie iii iir ir- irb irc ire iri irr irv ivb ivc ive ivi ivr ivv rbb rbc rbe rbi rbr rcb rcc rce rci rcr rcv re- reb rec ree rei rer rev rib ric rie rii rir riv rrb rrc rri rrr rvb rvc rve rvi rvr rvv v-e vbc vbi vbr vbv vcc vce vci vcr veb vec vee vei ver vi- vib vic vie vii vir viv vrb vrc vre vri vrr vvb vvc vvi vvr vvv