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os.name                Operating system name  
os.arch                Operating system architecture  
os.version            Operating system version  
file.separator            File separator ("/" on UNIX)  
path.separator            Path separator (":" on UNIX)  
line.separator            Line separator ("\n" on UNIX)  
user.name            User's account name  
user.home            User's home directory  
user.dir                User's current working directory

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