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$/**$ Returns a list containing the common item of the two given lists $*/$

public static List common$($List L$1,$ List L$2)\{$

$**$Code here$**$

return null;

$\}$

common: This method takes two lists List L$1,$ List L$2$ and returns a new list containing the items present in both of the two given lists. If there are no common items, it should return an empty list.