4a. In the card game Set, the deck consists of 81 cards, each with four attributes:

• number (one, two, three)
• color (red, green, purple)
• shape (diamond, squiggle, oval)
• texture (open, solid, striped). Each possible combination of attributes occurs exactly once. Build a Python list of tuples representing this deck; each tuples should include the four attributes in the order given above.

4b. Define a function is_set that, on input three distinct cards from your deck, returns True if and only if they form a "set" according to the rules of the game. That is, in each of the four attributes, they are either all the same (say, all green) or all different (say, one red, one green, one purple), not two of one and one of another (say, two greens and a red). If possible, make this a lambda function.

4c. In the game, one normally looks at twelve cards at a time and attempts to find a set among these. Write a lambda function that, given a list of cards, returns True if and only if it contains a set. Your answer may use the function is_set that you defined in 4b.