I want to check if a block is near or in a distance of a specific block. For example: some block y near to a "emerald_block" the player cannot break that block (the "some" block). I want to protect a certain place that when I put a "emerald_block". I'm learning, I don't use others plugins. How can I check that? I've tried a lot with everything I know (I'm not a veteran, I'm new).