At first glance I said 'But that's 2 letters'Then it dawned, nicely played
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Q4nobody,
Wed 10 Apr 2013, 14:47,
archived)
One letter, and one punctuation mark.I'm a bit free in my interpretation of the rules, but I think it just about stands...
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Enzyme is powered by sunlight,
Wed 10 Apr 2013, 14:52,
archived)