Which of the numbered features is a pyroclastic flow? 
Definitions:
Scooter Rental
A service offering scooters for temporary use, typically charged per minute or hour, popular in urban transport for short distances.
Car Rental
A service industry that provides temporary automobiles for a short period, typically ranging from a few hours to a few weeks.
Lagrange Multipliers
A strategy in mathematics for finding the local maxima and minima of a function subject to equality constraints.
Emergency Rooms
Specialized hospital departments that provide immediate treatment to patients with acute illnesses or injuries.
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