copy$\_$puzzle$()$ This function should accept a single parameter named puzzle, which is intended to represent a puzzle state. The function should create a deep copy of the list puzzle. To accomplish this, the function should perform the following steps: $1.$ Create an empty list named new$\_$puzzle. $2.$ Loop over the items in puzzle, which are all lists. For each sub$-$list, create a copy using the copy$()$ method. Append the new copy to new$\_$puzzle. $3.$ Return new$\_$puzzle.