-er -ic bbb bbc bbe bbi bbo bbr bbt bcb bcc bce bci bco bcr bct bcv be- beb bec bee bei beo ber bet bev bi- bib bic bie bii bio bir bit biv bob boc boe boi boo bor bot bov brb bre bri bro brr brt brv btb btc bte bti bto btr btt btv bvb bvc bve bvi bvo bvr bvt bvv c-- cbb cbc cbe cbi cbo cbr cbt cbv ccb ccc cce cci cco ccr cct ccv ce- ceb cec cee cei ceo cer cet cev ci- cib cic cie cii cio cir cit civ co- cob coc coe coi coo cor cot cov crb crc cre cri cro crr crt crv ctb ctc cte cti cto ctr ctt ctv cvb cvc cve cvi cvo cvr cvt cvv ebb ebc ebe ebi ebo ebr ebt ebv ec- ecb ecc ece eci eco ecr ect ecv eeb eec eee eeo eer eet eev eib eic eie eii eio eir eit eiv eo- eob eoc eoe eoi eoo eor eot erb erc ere eri ero err ert erv etb etc ete eti eto etr ett etv evb evc eve evi evo evr evt evv i-v ibb ibc ibe ibi ibo ibr ibt ibv icb icc ice ici ico icr ict icv ie- iec iee iei ier iet iev iib iic iie iii iio iir iit io- iob ioc ioe ioi ioo ior iot iov ir- irb irc ire iri iro irr irt irv itb itc ite iti ito itt itv ivb ivc ive ivi ivo ivr ivt ivv o-i ob- obb obc obe obi obo obr obt obv oc- ocb occ oci oco ocr oct ocv oeb oec oee oei oeo oer oet oib oic oie oii oio oir oit oiv oo- oob ooc ooi ooo oor oot oov or- orb orc ore ori oro orr ort orv ot- otb otc ote oti oto otr ott otv ov- ovb ovc ove ovi ovo ovv rbb rbc rbe rbi rbo rbr rbt rcb rcc rce rci rco rcr rct rcv re- reb rec ree rei reo rer ret rev rib ric rie rii rio rir rit riv rob roc roe roi roo ror rot rov rrb rrc rri rrr rrt rtb rtc rte rti rto rtr rtt rtv rvb rvc rve rvi rvo rvr rvt rvv tbb tbc tbe tbi tbo tbr tbt tbv tcb tcc tce tci tco tcr tct tcv te- teb tec tee tei teo ter tet tev tib tic tie tii tio tir tit tiv to- tob toc toe toi too tor tot tov trb trc tre tri tro trr trt trv ttb ttc tte tti tto ttr ttt ttv tvb tvc tve tvi tvo tvr tvt v-e vbc vbi vbo vbr vbv vcc vce vci vco vcr vct veb vec vee vei veo ver vet vi- vib vic vie vii vio vir vit viv vob voc voe voi voo vor vot vov vrb vrc vre vri vrr vrt vtb vtc vte vti vto vtr vtt vtv vvb vvc vvi vvo vvr vvt vvv