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sample space (where the order of the two flips is relevant) is {(H, T), (T, H), (T, T), (H, H)} where H means "heads" and T means "tails". Each of (H, T), (T, H), ... are possible outcomes of the experiment. We may define an event which occurs when a "heads" occurs in either of the two flips. This event contains all of the outcomes except (T, T).