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How to be the perfect beta
Pick a leader.
Make sure she is clever, pretty, and has great leadership skills. She should be able to make great decisions and come up with fool-proof plans in a short amount of time.
She should be smart and witty and have the same sense of humor as you. You won't want to fake-laugh your way through a friendship, and you won't want to have an incredibly clever moment and receive little or no credit for it.