Unable to find some blocks

I was doing a tutorial when I stumbled upon these sets of blocks. I tried looking for them but I could not find them. I don't know where I can find them. Can anybody help me with this?
thanks in advance:)


Thank you for a quick reply.
But I did have a look at the procedures section. Mine has only two blocks. These blocks.

Change to: procedure, write name of your procedure


these are custom procedures, you have to create them yourself..
see also MIT App Inventor Procedure Blocks


Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by Taifun.

Thank you Taifun and Juan Antonio for your help. I really appreciate it. Thank you again

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