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Statements:
All gliders are parachutes.
No parachute is an airplane.
All airplanes are helicopters.
Conclusions:
I. No helicopter is a glider.
II. All parachutes being helicopters is a possibility.
No parachute is an airplane and all airplanes are helicopters doesn't give an indication about the relation between parachutes and helicopters. So, all parachutes are helicopters is not contradicted in the statements.
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