Solve this ‘wordoku’ in the same way as a sudoku with letters instead of numbers (the nine letters once in each row, column and nine-square cell). Once solved, one of the overall diagonals contains the jumbled surname of a 19th century French chemist, pharmacist and botanist attributed with the isolation of gallic and ellagic acids, pyrogallol and chitin.

This week’s letters are: A B C E N O R S T

 

 

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