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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.

Saira says Muhammad was her "best friend", funny and always cheerful - "My mother worries that she's forgetting his smile."

The judge recounted: "After arrest you displayed no signs of agitation or mental distress. You were inappropriately cheerful and engaged the officers in conversation. You asked if the local schools were locked down."

There is a cheerful red awning and a newly painted cream wooden shopfront on the market square in Macclesfield.

The Toy Fair is his organisation's marquee event, drawing businesses from around the world who line New York's convention center with cheerful displays of blocks, high-contrast baby books and spiky coloured balls.