Write a composition on a screen at a traffic signal
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Traffic lights or traffic signals are signalling devices positioned at road intersections, pedestrian crossings, and other locations to control flows of traffic. The world's first traffic light was a manually operated gas-lit signal installed in London in December 1868.
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Glucose has four chiral carbons in its aldehyde form, and so there are 24, or 16 possible stereoisomers of this formula, only one of which is dextrose [(+)-glucose]. These 16 isomers are shown in Fig.
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