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while booleanexpression
statement(s)
end while

Execute the statement(s) inside the while loop until the booleanexpression evaluates to false. While / End While executes the statements zero or more times. The test is done before the code in the loop is executed.

Do / Until, For / Next

r = 1
while r < 6
  print r
  r = r + 1
end while

will display

1
2
3
4
5

0.9.4g