-er -ic bbb bbc bbe bbi bbo bbr bcb bcc bce bci bco bcr bcv be- beb bec bee bei beo ber bev bi- bib bic bie bii bio bir biv bob boc boe boi boo bor bov brb bre bri bro brr brv bvb bvc bve bvi bvo bvr bvv c-- cbb cbc cbe cbi cbo cbr cbv ccb ccc cce cci cco ccr ccv ce- ceb cec cee cei ceo cer cev ci- cib cic cie cii cio cir civ co- cob coc coe coi coo cor cov crb crc cre cri cro crr crv cvb cvc cve cvi cvo cvr cvv ebb ebc ebe ebi ebo ebr ebv ec- ecb ecc ece eci eco ecr ecv eeb eec eee eeo eer eev eib eic eie eii eio eir eiv eo- eob eoc eoe eoi eoo eor erb erc ere eri ero err erv evb evc eve evi evo evr evv i-v ibb ibc ibe ibi ibo ibr ibv icb icc ice ici ico icr icv ie- iec iee iei ier iev iib iic iie iii iio iir io- iob ioc ioe ioi ioo ior iov ir- irb irc ire iri iro irr irv ivb ivc ive ivi ivo ivr ivv o-i ob- obb obc obe obi obo obr obv oc- ocb occ oci oco ocr ocv oeb oec oee oei oeo oer oib oic oie oii oio oir oiv oo- oob ooc ooi ooo oor oov or- orb orc ore ori oro orr orv ov- ovb ovc ove ovi ovo ovv rbb rbc rbe rbi rbo rbr rcb rcc rce rci rco rcr rcv re- reb rec ree rei reo rer rev rib ric rie rii rio rir riv rob roc roe roi roo ror rov rrb rrc rri rrr rvb rvc rve rvi rvo rvr rvv v-e vbc vbi vbo vbr vbv vcc vce vci vco vcr veb vec vee vei veo ver vi- vib vic vie vii vio vir viv vob voc voe voi voo vor vov vrb vrc vre vri vrr vvb vvc vvi vvo vvr vvv