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a = 3;
b = 6;
c = 8;
v = [2, 5, 7];
t0 = echo();
echo(t0 = t0);
t1 = echo() undef;
echo(t1 = t1);
t2 = echo("t2");
echo(t2 = t2);
t3 = echo(a*b);
echo(t3 = t3);
t4 = echo(c = a*b);
echo(t4 = t4);
t5 = echo() a*b;
echo(t5 = t5);
t6 = echo(c = 2) a*b*c;
echo(t6 = t6);
t7 = echo() [a,b];
echo(t7 = t7);
t8 = echo() [for (i=[1:a]) [i,b]];
echo(t8 = t8);
function f1(x) = [ for (a = x) echo(a = a) a ];
echo("f1(v) = ", f1(v));
function f2(x, i = 0) = echo(i) len(x) > i ? x[i] + f2(x, i + 1) : 0;
echo("f2(v) = ", f2(v));
function f3(x, i = 0) = len(x) > i ? let(a = x[i] + f3(x, i + 1)) echo(a) a : 0;
echo("f3(v) = ", f3(v));
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