-er -ic bbb bbc bbd bbe bbi bbk bbo bbr bcb bcc bcd bce bci bck bco bcr bcv bdb bdc bdd bde bdi bdk bdo bdr bdv be- beb bec bed bee bei bek beo ber bev bi- bib bic bid bie bii bik bio bir biv bkb bkc bke bkk bko bkr bkv bob boc bod boe boi bok boo bor bov brb brd bre bri brk bro brr brv bvb bvc bvd bve bvi bvk bvo bvr bvv c-- cbb cbc cbd cbe cbi cbk cbo cbr cbv ccb ccc ccd cce cci cck cco ccr ccv cdb cdc cdd cde cdi cdk cdo cdr cdv ce- ceb cec ced cee cei cek ceo cer cev ci- cib cic cid cie cii cik cio cir civ ckb ckc ckd cki cko co- cob coc cod coe coi cok coo cor cov crb crc crd cre cri crk cro crr crv cvb cvc cvd cve cvi cvk cvo cvr cvv dbb dbc dbd dbe dbi dbk dbo dbr dbv dcb dcc dcd dce dci dck dco dcr dcv ddb ddc ddd dde ddi ddk ddo ddr de- deb dec ded dee dei dek deo der dev di- dib dic did die dii dik dio dir div dkb dkc dke dki dkk dko dkr dob doc dod doe doi dok doo dor dov drb drc drd dre dri drk dro drr drv dvb dvc dvd dve dvi dvk dvr ebb ebc ebd ebe ebi ebk ebo ebr ebv ec- ecb ecc ecd ece eci eck eco ecr ecv ed- edb edc edd ede edi edk edo edr eeb eec eed eee eek eeo eer eev eib eic eid eie eii eik eio eir eiv ekb ekc ekd eke eki eko ekr ekv eo- eob eoc eod eoe eoi eok eoo eor erb erc erd ere eri erk ero err erv evb evc evd eve evi evo evr evv i-d i-v ibb ibc ibd ibe ibi ibk ibo ibr ibv icb icc icd ice ici ick ico icr icv idb idc idd ide idi idk ido idr idv ie- iec ied iee iei iek ier iev iib iic iid iie iii iio iir ikb ikc ike iki ikk iko ikr ikv io- iob ioc iod ioe ioi ioo ior iov ir- irb irc ird ire iri irk iro irr irv ivb ivc ivd ive ivi ivo ivr ivv kbb kbc kbd kbe kbi kbk kbo kbr kcb kcc kcd kce kci kck kcr kdb kdc kde kdk kdo kdr ke- keb kec ked kee kei kek keo ker kev kib kic kid kie kii kik kio kir kiv kkb kkc kke kki kkk kkr kkv kob koc kod koe koi kok koo kor krc krd kri krk kro krr krv kvb kvi kvk kvo kvr kvv o-i ob- obb obc obd obe obi obk obo obr obv oc- ocb occ ocd oci ock oco ocr ocv odb odc odd ode odi odo odr odv oeb oec oed oee oei oeo oer oib oic oid oie oii oik oio oir oiv okb okc okd oke oki okk oko okr oo- oob ooc ood ooi ook ooo oor oov or- orb orc ord ore ori ork oro orr orv ov- ovb ovc ovd ove ovi ovo ovv rbb rbc rbd rbe rbi rbk rbo rbr rcb rcc rcd rce rci rco rcr rcv rdb rdc rdd rde rdi rdo rdr rdv re- reb rec red ree rei rek reo rer rev rib ric rid rie rii rik rio rir riv rkb rkc rke rkk rko rkv rob roc rod roe roi rok roo ror rov rrb rrc rrd rri rrk rrr rvb rvc rvd rve rvi rvo rvr rvv v-e vbc vbd vbi vbk vbo vbr vbv vcc vcd vce vci vco vcr vdb vdc vdd vde vdi vdk vdo vdr vdv veb vec ved vee vei vek veo ver vi- vib vic vid vie vii vik vio vir viv vkb vob voc vod voe voi vok voo vor vov vrb vrc vrd vre vri vrk vrr vvb vvc vvi vvo vvr vvv