A radial dimension of a pipe is changed by applying contiguous pipe contacting surfaces of adjacent cam rollers. 0 or less are disclosed, as well as the combination of a blue and red substantive dye wherein the weight ratio of the blue dyes as opposed to the red dyes is 1 or greater. The carbon dioxide is separated out and the hydrogen and carbon monoxide mixture is fed to a cold box where it is separated into hydrogen-rich and carbon monoxide-rich streams. In this way, the terminal has no knowledge of the actual keys pressed and the secrecy of the alphanumeric data is ensured.