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# XOR

The Boolean operators have an order: First NOT, then AND, last OR.
If you want to change this order, use parentheses:

In the following task you should code another important gate, the XOR (eXclusive OR) gate.

```
let x1 = true || false && false;
let x2 = (true || false) && false;
let x3 = !false && false;
let x4 = !(false && false);
```

In the 1st line `&&`

is evaluated first. `x1`

is `true`

.
In the 2nd line `||`

is evaluated first. `x2`

is `false`

.
In the 3rd line `!`

is evaluated first. `x3`

is `false`

.
In the 4th line `&&`

is evaluated first. `x4`

is `true`

.In the following task you should code another important gate, the XOR (eXclusive OR) gate.

## Exercise

Write a function

I.e.: The calls

`xor`

that takes two Boolean values. If both values are different, the result should
be `true`

. If both values are the same, the result should be `false`

.I.e.: The calls

`xor(true, false)`

and `xor(false, true)`

should return `true`

.
The calls `xor(true, true)`

and `xor(false, false)`

should return `false`

.