STEP 7: Let's assign our newest event to a brand new key: 's'!

Remember, the line that reads stage.event_key("a",·a_key)¬ is called the event handler.

• In the line that reads: def·a_key():, change the event name to s_key().
• In the event handler, change the first argument to "s" .
• Change the second argument in the event handler to s_key.

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