Multi Language Blog Link="alternate"

I am transforming my blog into a multilingual site.

considering that my main post is in English, within the code injection of the post, do I have to insert many link tags with “alternate” for all the translated languages? or is a single link tag enough to enclose them all?

I’ll explain:

<link rel="alternate" hreflang="es" href="" />
<link rel="alternate" hreflang="ge" href="" />
<link rel="alternate" hreflang="au" href="" />

or something like that:

<link rel="alternate" hreflang="es-ge-au" href="{{hreflang}}/{{post-link}}" />