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How many pi bonds are in the following two molecules,respectively from left to right?
Firefighter's Helmet
A firefighter's helmet is designed to protect firefighters from heat, falling objects, and other hazards while combating fires.
Excludable
A characteristic of a good or service that means it can be restricted to paying customers only.
Rival In Consumption
A characteristic of a good whereby one person's consumption reduces its availability for another person.
Externality
An externality is a consequence of an economic activity experienced by unrelated third parties; it can be either positive (beneficial) or negative (harmful).
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