Implement a CardHand class that supports a person arranging a group of cards in his or her hand. The simulator should represent the sequence of cards using a single positional list ADT so that cards of the same suit are kept together. Implement this strategy by means of four “fingers” into the hand, one for each of the suits of hearts, clubs, spades, and diamonds, so that adding a new card to the person’s hand or playing a correct card from the hand can be done in constant time. The class should support the following methods:
• addCard(r, s): Add a new card with rank r and suit s to the hand.
• play(s): Remove and return a card of suit s from the player’s hand; if there is no card of suit s, then remove and return an arbitrary card from the hand.
• iterator( ): Return an iterator for all cards currently in the hand.
• suitIterator(s): Return an iterator for all cards of suit s that are currently in the hand.
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