2. Find the numerical substitutions that make the following equation hold: LEFT LEFT + LEFT RI GHT where L, E, F, T, R, I, G, H are all different single digit number {0, 1, 2, 3 .., 9). Obviously, R and L cannot be 0. a. Write down the high-order constraints for this equation. b. Draw the search tree that converts the high order constraints to binary constraints. C. Write down a solution.

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