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Secret Squares (1172)
Instruction:
Place a natural number (positive integer) into each cell so that each cell has one number and all the numbers are different. The sum of the numbers in each row, each column, and the two main diagonals must be identical; this sum is provided for you. Each letter represents a different (base ten) digit. The numbers of some cells are given for you, either in letters, digits, or both. Partial numbers are never given (for example, if one letter is given, then the number cannot have two digits). The correspondence between letters and digits is for you to discover. Numbers cannot start with the digit 0 (zero).