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// functions

calculateAge(1965); // 51

function calculateAge(year) {

console.log(2016 - year);

}

// retirement(1956);

var retirement = function (year) {

console.log(65 - (2016 - year));

}

// variables

console.log(age); // Undefiened

var age = 23;

function foo() {

console.log(age); // Udefined

var age = 65;

console.log(age); // 65

}

foo();

console.log(age); // 23