Hi all,
   I have two questions. Can some one give some help?

   The first question is regarding the pair of operators "&" and "&&". What
is the
difference between the two?

   The second question is regarding "<-" and "=".  Usually we use
"<-" as the assignment operator. I saw some people use "=". Is there
any difference between the two.

     Thank you!!
             Hannah

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