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Multiple functions

Now we define more then one function. As a reminder: A function with name color returning the value 'red' is defined as followed: 
function color() {
  return 'red';
}

Exercise

Define two functions. The first function a should return 'Hello a!' and the second function b should return 'Hello b!'.
function a() {
  return ...
}

function b() {
  return ...
}
function a() {
  return 'Hello a!';
}

function b() {
  return 'Hello b!';
}

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