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while true do rs.setOutput(dir[n],false) n=1+(n)%4 rs.setOutput(dir[n],true) repeat sleep(0.5) until rs.getInput('top')==false end
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local dir = {"back","right","front","left"}
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local n = 4
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while true do 
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  rs.setOutput(dir[n],false)
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  n=1+(n)%4
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  rs.setOutput(dir[n],true)
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  repeat 
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    sleep(0.5) 
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  until rs.getInput("top")==false
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end