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I WAS going to start this article another way. But that was before my 10-year-old daughter intervened. In fact, I had already begun writing when she bounced up and tried to scam me. She offered to bet me £10 that she could make an ordinary pencil write in the colour red. Alas for the budding entrepreneur, I refused the bet: she was too confident, so I suspected she had something up her sleeve. But I did let her reveal her trick. She took a lead pencil and wrote “in the colour red”. Then she laughed like a hyena and went…