Process for manufacturing oxirane by reaction of an olefin with a peroxide compound in the presence of a catalyst and a solvent in at least two reactors arranged in series, each of which contains a portion of the catalyst, according to which two epoxidation reactions are carried out in series including intermediate distillation, to minimize the formation of by-products. Methods for producing a maize plant that comprise crossing inbred maize line PHCAM with another maize plant. The second coupling means is capable of transferring at least the majority of the towing force between the towing vehicle and the trailer. The indication may also contain the acknowledgment number, which allows processing of the encrypted traffic based on the acknowledgment number.