-er -ic b-u bbb bbc bbe bbi bbo bbr bbu bcb bcc bce bci bco bcr bcu bcv be- beb bec bee bei beo ber beu bev bi- bib bic bie bii bio bir biu biv bob boc boe boi boo bor bou bov brb bre bri bro brr bru brv bub buc bue bui buo bur buu bvb bvc bve bvi bvo bvr bvu bvv c-- cbb cbc cbe cbi cbo cbr cbu cbv ccb ccc cce cci cco ccr ccu ccv ce- ceb cec cee cei ceo cer ceu cev ci- cib cic cie cii cio cir ciu civ co- cob coc coe coi coo cor cou cov crb crc cre cri cro crr cru crv cub cuc cue cui cuo cur cuu cuv cvb cvc cve cvi cvo cvr cvu cvv ebb ebc ebe ebi ebo ebr ebu ebv ec- ecb ecc ece eci eco ecr ecu ecv eeb eec eee eeo eer eev eib eic eie eii eio eir eiu eiv eo- eob eoc eoe eoi eoo eor eou erb erc ere eri ero err eru erv eu- eub euc eue eui eur euv evb evc eve evi evo evr evv i-v ibb ibc ibe ibi ibo ibr ibu ibv icb icc ice ici ico icr icu icv ie- iec iee iei ier iev iib iic iie iii iio iir iiu io- iob ioc ioe ioi ioo ior iou iov ir- irb irc ire iri iro irr iru irv iu- iub iuc iue iui iur ivb ivc ive ivi ivo ivr ivu ivv o-i ob- obb obc obe obi obo obr obu obv oc- ocb occ oci oco ocr ocu ocv oeb oec oee oei oeo oer oib oic oie oii oio oir oiu oiv oo- oob ooc ooi ooo oor oov or- orb orc ore ori oro orr oru orv ou- ouc oue oui ouo our ov- ovb ovc ove ovi ovo ovv rbb rbc rbe rbi rbo rbr rbu rcb rcc rce rci rco rcr rcu rcv re- reb rec ree rei reo rer reu rev rib ric rie rii rio rir riv rob roc roe roi roo ror rou rov rrb rrc rri rrr rru rub ruc rue rui ruo rur ruu ruv rvb rvc rve rvi rvo rvr rvu rvv ubb ubc ube ubi ubo ubr ubu ubv ucb ucc uce uci uco ucr ucu ucv ueb uec uee uei uer uib uic uie uii uio uir uiu uob uoc uoe uoo uor ur- urb urc ure uri uro urr uru uuc uue uur uuu uvb uvc uve uvo uvu uvv v-e vbc vbi vbo vbr vbv vcc vce vci vco vcr vcu veb vec vee vei veo ver veu vi- vib vic vie vii vio vir viu viv vob voc voe voi voo vor vou vov vrb vrc vre vri vrr vru vue vur vuv vvb vvc vvi vvo vvr vvv