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A British couple has defied the odds again by giving birth to a second set of black and white twin girls.

Doctors say the phenomenon is so rare, that there are no statistics to illustrate the probability of it happening. 

“Even non-identical twins aren’t that common. Non-identical twins from mixed parents, of different races, less common still. To have two eggs fertilized and come out two different colors, less common still. So, to have it happen twice must be one in millions,” explains Dr. Sarah Jarvis.

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