<p>For example so that it works like this
toString (Var x)= "x"</p>

Use the
```
show
```
function:
```
```
putStrLn (show x)
```
```
will print out the "x" variable. (Naturally, you don't need to use it with
```
putStrLn
```
, either --
```
show
```
returns a string that can be used anywhere like a string.)