For example, people often say "Be quiet," but they don't tell you how long to be...

For example, people often say "Be quiet," but they don't tell you how long to be quiet for. Or you see a sign which says KEEP OFF THE GRASS but it should say KEEP OFF THE GRASS AROUND THIS SIGN or KEEP OFF ALL THE GRASS IN THIS PARK because there is lots of grass you are allowed to walk on.

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