delimiters ();
outer end;
tracingonline:=1;
path p[]; p0=(0,0)..(3,3); p1=(0,0)..(3,3)..cycle;
pair z[]; z0=(0,0); z1=(x,y); z2=(3,5);
boolean b[]; b0=false; b1=true;
string s[]; s0="cat"; s1="picnic";
edges e[]; e0:=nulledges; addto e0 doublepath p0 withpen pencircle;
pen q[]; q0=pencircle; q1=makepen(p1);
transform t[],identity;
(0,0) transformed identity = (0,0);
(1,0) transformed identity = (1,0);
(0,1) transformed identity = (0,1);

forever: message("gimme an exp: "); readterminal the_exp;
scrollmode; showall the_exp;
endfor