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The French author Georges Perec (1936–1982) once wrote a book, La disparition, without the letter ‘e’. He was a member of the Oulipo group. A quote from the book:Tout avait Pair normal, mais tout s’a...

Consider equations having the following form:ax12+b*x22+cx32+d*x42=0a, b, c, d are integers from the interval [-50,50] and any of them cannot be 0.It is consider a solution a system ( x1,x2,x3,x4 )...