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function g(n) {
var s;
switch (n) {
case 0:
s = "c"+n;
break;
default:
s = "d"+n;
break;
}
return s;
}
// Do it twice with different initial values for 'i' to allow for 8
// being even or odd.
var s = "";
for (let i = 0; i != 30; i+=2) {
s += g(i%4/2);
}
assertEq(s, "c0d1c0d1c0d1c0d1c0d1c0d1c0d1c0");
var s = "";
for (let i = 2; i != 30; i+=2) {
s += g(i%4/2);
}
assertEq(s, "d1c0d1c0d1c0d1c0d1c0d1c0d1c0");