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Browsing r27906 of Parser.php and noticed this bit of code..  (line 586)

/**
 * Add an item to the strip state
 * Returns the unique tag which must be inserted into the stripped text
 * The tag will be replaced with the original text in unstrip()
 *
 * @private
 */
function insertStripItem( $text ) {
	static $n = 0;
	$rnd = "{$this->mUniqPrefix}-item-$n-{$this->mMarkerSuffix}";
	$this->mStripState->general->setPair( $rnd, $text );
	return $rnd;
}


It appears that $n should be incremented each time its called.