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However, she relaxed after seeing how cheerful the barbers were when teasing her 7-year-old grandson.

"She was a very active cheerful woman like myself," Barrie recalls, adding: "She loved animals and she loved birds and she was fond of children."

In fact, it said they had observed staff engaging prisoners in "cheerful but respectful light-hearted banter".

He is cheerful and serious, even about play.

Such cheerful platitudes would carry a taint of irony, in retrospect, when authorities exposed the harm and suffering they alleged had been inflicted under Guo's watch.