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Anyone else out there of european descent, left hand dominant with O negative blood, green eyes and blonde hair? Where can we find some information to have our theoretical background in our study? How many different 4-digit numbers can be formed using the digits 2, 4, 5, 6, and 7 so that no digits repeat & the number is divisible by 4? Solve the equation: 2 sin^2 x = sin x? What kind of elephant eats meat?