#WBL 20 Dec 2020 use 
#gawk -f lisp2dot.awk eg1.lisp >! /tmp/eg1.dot
#dot /tmp/eg1.dot  -Tpng -o /tmp/eg1.png
#convert /tmp/eg1.png -transparent white eg1.gif

(MUL (ADD x 0.997) -0.052)