For every mile you walk, you burn 100 calories.

Reinforcer: the 100 calories


You go to Las Vegas and play Blackjack

Reinforcer: Hoping to win a lot of money


If the football team wins on Friday varsity gets to watch film after school at 3 pm.

Reinforcer: the team winning

Variable Interval

Waiting for a taxi to pick you up at the airport

Reinforcer: the taxi

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