Clear R console 
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For Mac users: 4 methods
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    a) source('http://datayyy.com/rpy.txt')
      .cls()

    b) # define your own function
       cls<-function()cat(rep("\n",50))
       cls()

    c) cat("\014")   # ??

    d) cat("\f")     # ??

For windows users: 
-----------------
   a) Ctrl-l         # combination of the Ctrl-key and letter L key

   b) source('http://datayyy.com/rpy.txt')
      .cls()

   c) # define your own function
      cls<-function()cat(rep("\n",50))
      cls()

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Virtual Lab for Mac users 
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 The Virtual Lab is a cloud-based Windows computer lab that provides users 
     remote access to hardware and software that they would otherwise have to 
     install themselves on their own systems, or visit a computer lab to use. 
 
 Type the following command to see more

   .virtualLab   # or 

   .vl           # short-cut for .virtualLab, where l is lowercase of letter L)

   .v1           # short-cut for .virtualLab, where 1 is number 1 

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Laptop vs. Chromebook
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 Laptop vs. Chromebook: What's the difference and which best fits your needs
    Some Chromebooks can go toe-to-toe with Mac and Windows laptops, but they
    may not be best for everyone. Here's how to choose what's right for you.

  Chromebooks are laptops and two-in-ones running on Google's Chrome operating 
     system. The hardware might look like any other laptop, but the minimalistic,
     web-browser-based Chrome OS is a different experience from the Windows 
     and MacOS laptops you're likely used to. Whether you're considering 
     switching to one from a Windows laptop or MacBook, your kid received 
     one from their school or you're simply Chrome OS curious, here's everything you need to know. 

 For more, see the following link
     https://www.cnet.com/tech/computing/laptop-vs-chromebook-whats-the-difference-and-which-best-fits-your-needs/

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