View difference between Paste ID: gFKk6WvL and tik9BXjP
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local modem = peripheral.find("modem")
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rednet.open("top")
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4-
 local id, message
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 repeat
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 	local id, message
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 id, message = rednet.receive()
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 	id, message = rednet.receive()
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 until id == 3
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 		if message == "N4" then
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 redstone.setOutput("back", true)
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 		redstone.setOutput("back", true)
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 sleep(0.4)
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 		sleep(0.4)
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 redstone.setOutput("back", false)
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 		redstone.setOutput("back", false)
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 		end
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end
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