13  CHANGED: ASCAN()
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     ASCAN()'s search argument supports both a value and a code block.
     If the <expSearch> argument is a code block, ASCAN() scans the
     <aTarget> array executing the block for each element accessed.  As
     each element is encountered, ASCAN() passes the element's value as
     an argument to the code block, and then performs an EVAL() on the
     block.  The scanning operation stops when the code block returns
     true (.T.), or ASCAN() reaches the last element in the array.