Nineties kids were raised on twin propaganda. “Full House” and “It Takes Two” darlings Mary-Kate and Ashley Olsen ruled young Hollywood. “Sister, Sister” stars Tia and Tamera Mowry led enviable lives on television. Lindsay Lohan doubled in cool factor when duplicated on-screen in “The Parent Trap.” All of those actresses played twins separated at birth who encounter each other later in life, completely by accident. The lesson for viewers: If you didn’t already have a look-alike, maybe you just hadn’t found them yet.

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