Puzzle: answer

Last month I set the following puzzle. Here is a sequence of 11 consecutive instances of ‘had’: had had had had had had had had had had had

I asked readers to punctuate this sequence to turn it into a perfectly valid English text.

Here is the context: John and Tom had each written a sentence for their teacher, who had approved of John’s sentence.

Answer: John, where Tom had had “had”, had had “had had”. “Had had” had had the teacher’s approval.

So Tom had written “had”, John had written “had had” and the teacher had approved of John’s sentence containing “had had”.