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STRIP(<string>, [{'B'|'L'|'T'}], [<list>])
      returns a string

Removes spaces (by default) or any character in <list> from the leading,
trailing, or both ends (specified by the option used as the second
argument) of <string>. The default option is 'B'.

   Example:
         say '|'strip('   understand   ')'|';         >>> |understand|
         say '|'strip('   understand   ',L)'|';       >>> |understand   |
         say '|'strip('___understand___',T,'_')'|';   >>> |___understand|
         say strip('understand',,'dnu')               >>> ersta

   Also see 
            

The examples above use the abuttal  concatenation operator  to add the
character '|' to the beginning and end of the string returned by STRIP().

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