procedure lindgen: rewrite L-system procedure lindgenx: rewrite L-system
link lindgen
April 5, 1998; Ralph E. Griswold
This file is in the public domain.
lindgen() assumes a "full" mapping table; lindgenx() does not.
Note that the first argument is a single character. At the top level
it might be called as
lindgen(!axiom, rewrite, gener)