-er c-- ccc cce ccm cco ccr cct ccv ce- cec cee cem ceo cer cet cev cmc cme cmm cmo cmr cmt cmv co- coc coe com coo cor cot cov crc cre crm cro crr crt crv ctc cte ctm cto ctr ctt ctv cvc cve cvm cvo cvr cvt cvv ec- ecc ece ecm eco ecr ect ecv eec eee eem eeo eer eet eev em- emc eme emm emo emr emt emv eo- eoc eoe eom eoo eor eot erc ere erm ero err ert erv etc ete etm eto etr ett etv evc eve evm evo evr evt evv m-o m-r m-v mc- mcc mce mcm mco mcr mct mcv mec mee mem meo mer met mev mmc mme mmm mmo mmr mmt mmv moc moe mom moo mor mot mov mrc mre mrm mro mrr mrt mrv mtc mte mtm mto mtr mtt mtv mvc mve mvm mvo mvr mvt mvv oc- occ ocm oco ocr oct ocv oec oee oem oeo oer oet om- omc ome omm omo omr omt omv oo- ooc oom ooo oor oot oov or- orc ore orm oro orr ort orv ot- otc ote otm oto otr ott otv ov- ovc ove ovo ovv rcc rce rcm rco rcr rct rcv re- rec ree rem reo rer ret rev rmc rme rmm rmo rmr rmt rmv roc roe rom roo ror rot rov rrc rrm rrr rrt rtc rte rtm rto rtr rtt rtv rvc rve rvm rvo rvr rvt rvv tcc tce tcm tco tcr tct tcv te- tec tee tem teo ter tet tev tmc tme tmm tmo tmr tmt tmv to- toc toe tom too tor tot tov trc tre trm tro trr trt trv ttc tte ttm tto ttr ttt ttv tvc tve tvm tvo tvr tvt v-e vcc vce vcm vco vcr vct vec vee vem veo ver vet vm- vmc vmm vmo vmr vmt voc voe vom voo vor vot vov vrc vre vrm vrr vrt vtc vte vtm vto vtr vtt vtv vvc vvm vvo vvr vvt vvv