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Define a recursive Scheme function transpose that performs matrix transposition on its input. Both the input and the output matrix are represented as a list of lists, where each row is represented as a sublist. Example: (transpose '((1 2 3) (4 5 6) (7 8 9))) evaluates to ((1 4 7) (2 5 8) (3 6 9)). Your approach should be row-wise recursive, in the sense that you should call the function recursively on the submatrix obtained from the original by removing the first row.