The separation of single-walled carbon nanotubes, by electronic type using centrifugation of compositions of SWNTs and surface active block copolymers in density gradient media. A net premium payment is allocated to a fixed income investment and an annual fixed income yield is projected. The wrench adaptor is shown in two embodiments\u2014a single-ended and a double-ended form. One or more, or all, of the vector table entries direct the CPU to execute the code authentication process prior to executing an event handler when an exception event occurs. The well region has a second type of conductivity.