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 German chemist. In which area of chemistry did he specialise, writing several standard reference works and launching a journal that carried his name?

This week’s letters are: E F I N O R S T U

 

 

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