And it need not detract from the other by one iota as, being his own master, he would have heaps of time to practise literature in his spare moments when desirous of so doing without its clashing with his vocal career or containing anything derogatory whatsoever as it was a matter for himself alone.
There are no more uses of "detract" in the book.
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I think she’s made a good case. I can neither add to it nor detract from it.