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 for call/cc
From The Free On-line Dictionary of Computing (30 December 2018) :

      (call/cc) A Lisp control function that
     implements the continuation passing style of programming.
     In continuation passing style (CPS), every function f takes an
     extra final argument k called the "continuation".  The
     continuation is itself a function and represents the rest of the
     program.  Instead of just returning a value in the normal way, f
     passes it as an argument to k and returns the result of that.
     call/cc takes a function f as its argument and calls f, passing it
     the current continuation k.  It thus allows a CPS function to be
     called in a non-CPS (direct) context.
     For example, if the final result is to print the value returned by
     call/cc then anything passed to k will also be printed.
     E.g, in Scheme:
      (define (f k)
     	 (k 1)
     	 (k 2)
      (display (call-with-current-continuation f))
     Will display 1.
     [Is this correct?]

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