Origin for each line in src/heron.txt from check-in 5ce5316a33:

5ce5316a33 2021-03-01 jeff@gridfini: a*(b+c*(d+e*(f+g*(h+j*(k+l*(m+n*(o+p*(q+r))))))));
5ce5316a33 2021-03-01 jeff@gridfini: z:=ws;
5ce5316a33 2021-03-01 jeff@gridfini: off factor;
5ce5316a33 2021-03-01 jeff@gridfini: z;
5ce5316a33 2021-03-01 jeff@gridfini: on factor;
5ce5316a33 2021-03-01 jeff@gridfini: z;
5ce5316a33 2021-03-01 jeff@gridfini: end;