Hi,

I am having trouble understanding the -> syntax in elm. 

For example 

if we have the function:

plusTwo x = x + 2

it's type definition will be as follows: 
<function> : number -> number

this is pretty straight forward

however, if we have the function

add x y = x + y

its type definition is:
<function> : number -> number -> number

why is it not 

<function> number number -> number?

What does -> denote exactly.

Thanks in advance.

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