Variável mensagem de erro

Tell us what’s happening:
i am new here, this cod is sending error message, help me please.

Your code so far

// Only change code below this line
var a;
var b;
var c;
// Only change code above this line

a = 5 + 1;
b = 10 + 5;
c = "I am a"+ " String!";

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.82 Safari/537.36.

Challenge: Understanding Uninitialized Variables

Link to the challenge:

You need to only change code inbetween these two comments. You shouldn’t change the last three lines.

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