At my college, you had a "white list" of allowed items. Basically writing tools, rules and geometry tools, calculators as appropriate, and bottled water were allowed, everything else was banned.
No audio equipment, no food, no medcines without a doctor's note, no confectionery.
No ambiguity, no problem.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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