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a2+b2+c2+d2=ab+bc+cd+da\large{a^2+b^2+c^2+d^2=ab+bc+cd+da}a2+b2+c2+d2=ab+bc+cd+daDo there exist distinct reals a,b,c,da,b,c,da,b,c,d which satisfy the above equation?
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