anchor.diff:  tree?,procedure,2,http://www.cs.indiana.edu/cgi-pub/c211/wombat/docs/c211-tree.htm#tree?
   
   ; c211 turtle library
  +turtle,library,2,http://www.cs.indiana.edu/cgi-pub/c211/wombat/docs/c211-turtle.htm
   hatch,procedure,2,http://www.cs.indiana.edu/cgi-pub/c211/wombat/docs/c211-turtle.htm#hatch
   clone,procedure,2,http://www.cs.indiana.edu/cgi-pub/c211/wombat/docs/c211-turtle.htm#clone
   live-display,parameter,2,http://www.cs.indiana.edu/cgi-pub/c211/wombat/docs/c211-turtle.htm#live-display
  
positive.code: yellow,procedure,2,
  
  ; c211 matrix library
  draw-matrix,procedure,2,http://www.cs.indiana.edu/cgi-pub/c211/wombat/docs/c211-matrix.htm#draw-matrix
  make-matrix,procedure,2,http://www.cs.indiana.edu/cgi-pub/c211/wombat/docs/c211-matrix.htm#make-matrix
  matrix-cols,procedure,2,http://www.cs.indiana.edu/cgi-pub/c211/wombat/docs/c211-matrix.htm#matrix-cols
  
negative.code: ; c211 image library
  image,library,2,http://www.cs.indiana.edu/cgi-pub/c211/wombat/docs/c211-image.htm
  black,procedure,2,
  blue,procedure,2,
  color,procedure,2,http://www.cs.indiana.edu/cgi-pub/c211/wombat/docs/c211-image.htm#color
  