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function f() = [for(a = [0 : 4]) (pow(2, a))];
//Parameter("")
y = 0;
//Parameter("")
z = 1;
a = [for(x = [0 : 3]) ([for(y = [10 : 13]) ([x, y])])];
echo([]);
echo([let(x = 2) 1]);
echo([let(x = 2) x]);
echo([let(x = 2) x]);
echo([if(y) (1)]);
echo([if(z) (1)]);
echo([for(x = [y, z]) (x)]);
echo([for(x = [y : z]) (x)]);
echo([for(x = [0 : -1 : 10]) (x)]);
echo([for(x = [10 : 1 : 0]) (x)]);
echo([for(x = [0 : 10]) (x)]);
echo([for(x = [0 : 3]) (for(y = [10 : 13]) ([x, y]))]);
echo([for(x = [0 : 3]) (for(y = [10 : 13]) ([x, y]))]);
echo([for(x = [0 : 3]) ([for(y = [10 : 13]) ([x, y])])]);
echo([for(x = [0 : 3]) (if((x == 1)) ([for(y = [10 : 13]) (if((y != 11)) ([x, y]))]))]);
echo(a);
echo([for(a = "") (a)]);
echo([for(a = "a↑b😀") (a)]);
echo([for(i = a) (for(j = i) (j))]);
echo([for(i = a) (for(j = i) (for(k = j) (k)))]);
echo([for(i = a) (for(j = i) (j))]);
echo([for(i = a) (for(j = i) (for(k = j) (k)))]);
echo([for(a = [0 : 1]) (a)]);
echo([for(a = [0 : 1]) (if(true) (a))]);
echo([for(a = [0 : 1]) (if(true) (if(true) (a)))]);
echo([for(a = [0 : 1]) (for(b = [a : 2]) ([b, a]))]);
echo([for(a = [0 : 1]) (if(true) (for(b = [a : 2]) ([b, a])))]);
echo([for(a = [0 : 1]) (if(true) (if(true) (for(b = [a : 2]) ([b, a]))))]);
echo([-1, for(a = [0 : 1 : 3]) (a), for(b = [3 : -1 : 0]) (b), -1]);
echo([for(a = [2 : 3]) ((a * 2)), for(a = [5 : 9]) (if(((a % 2) == 0)) ([a, (a + 1)])), -1]);
echo([for(a = [0, 1, 2]) (if((a == 1)) ("-") else ("+"))]);
echo([for(a = [0, 1, 2]) (if((a > 0)) (if((a == 1)) ("A") else ("B")))]);
echo([for(a = [0, 1, 2]) (if((a > 0)) (if((a == 1)) ("A") else ("B")) else ("-"))]);
echo([for(a = [0 : 3]) (if((a < 2)) (if((a < 1)) (["+", a]) else (["-", a])))]);
echo([for(a = [0 : 3]) (if((a < 2)) (if((a < 1)) (["+", a])) else (["-", a]))]);
echo([for(a = [2 : 4]) (each ([a, (a * a)]))]);
echo([each (["a", "b"]), each ([-5 : -2 : -9]), each (f()), each ("c"), each (42), each (true)]);
echo([for(i = 2;(i <= 10);i = (i + 2)) i]);
echo([for(i = 1, n = 1;(i <= 4);i = (i + 1), n = ((n + i) * i)) [i, n]]);
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