What's an obluse block?
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You mean the obsolete blocks? Those are blocks added in a later version of Scratch, one that you don't have. Let's say that I'm using Scratch 1.3, and I'm playing a project made in 1.4 (I've downloaded the project). I look at the new blocks added. They say "obsolete"!
Well, that's pretty much it.
I don't think you can import and export obsolete blocks, sorry.
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