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 for while loop
From The Free On-line Dictionary of Computing (30 December 2018) :

  while loop
      The loop construct, found in nearly all
     procedural languages, that executes one or more instructions
     (the "loop body") repeatedly so long as some condition
     evaluates to true.  In contrast to a repeat loop, the loop
     body will not be executed at all if the condition is false on
     entry to the while.
     For example, in C, a while loop is written
     	while () ;
     where  is any expression and  is any
     statement, including a compound statement within braces
     A for loop, e.g. in the C language, extends the while loop
     syntax to collect pre-loop initialisation and loop-end logic
     into the beginning of the statement.
     Perl provides the "until" loop that loops until the loop
     condition is true.

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