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import os
import sys
def printInstructions( clearCommand ):
os.system( clearCommand )
if os.name == "nt" or os.name == "dos":
clearCommand = "cls"
print "You are using a Windows system."
elif os.name == "posix": # UNIX-compatible system
clearCommand = "clear"
print "You are using a UNIX-compatible system."
else:
sys.exit( "Unsupported OS" )
printInstructions( clearCommand )
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