// Initialize these three variables
var a;
var b;
var c;
// Do not change code below this line
a = a + 1;
b = b + 5;
c = c + " String!";
var a=6;
var b=15;
var c = "I am a string!";
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You have to give those variables some values, according to the challenge description, a should equal 5, b should equal 10, and c should equal “I am a” string.
Did you get it to work now? You probably just misplaced the code. The entire thing should look like this:
// Initialize these three variables
var a = 5;
var b = 10;
var c = "I am a";
// Do not change code below this line
a = a + 1;
b = b + 5;
c = c + " String!";