Im not sure if my question is correct because im new to the software but

I am following a really good tutorial https://www.artstation.com/artwork/qgD3D but im stuck..

So there are 4 rocks outputs here.

and the next step there is a single node with all 4 rocks included

How to combine those outputs? im sure its a really simple process and thats why he doesnt show it but i can't figure it out.

Thanks in advance

I am following a really good tutorial https://www.artstation.com/artwork/qgD3D but im stuck..

So there are 4 rocks outputs here.

and the next step there is a single node with all 4 rocks included

How to combine those outputs? im sure its a really simple process and thats why he doesnt show it but i can't figure it out.

Thanks in advance