/*
 *  Comment with some lines dot-quoted out.
 *  The formula may be found on page 34 of Whitehead's "Bistromathics
 *  for Fun and Squalor", ed 34.
 *
 *. However, for those of you who don't have a library card yet, it is:
 *.  
 *.                     |A|^2 + |B|^2 - |B-A|^2
 *.     cos(theta)  =  --------------------------
 *.                             2|A||B|
 *.
 *  Compare also with the formula for angle of Incident versus angle
 *  of Retribution.
 */
void quote();