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LOOP
	Begin a repeated section

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Format
	Loop	[ Until condition ]
		[ While condition ]
		[ For target = initial_expr to end_expr ]  [ by increment_expr]]

	The condition is tested at the top of the loop.
	For the LOOP FOR format, the increment expression (increment_expr) defaults to one and exits the loop when the target is greater than the end expression (end_expr). If the increment expression is negative, the loop exits if the target is less than the end expression.

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Example
	Loop
	If %ACTION then Exit
	If %ITEM < "B" then Continue
	Gosub B
	End_loop
	Loop for row = 1 to n by 2
	Print to FORM Pos(row,2); "ITEM";row
	End_loop