Theory:

A mind map is a flow chart that represents the main events of a story. It helps us to remember the main events in a pictorial format. Since it is in the form of a picture, it is easier to remember the main events of the story. Writing a summary after looking at the mind map is easy, as all the main points are highlighted. With the given information, paragraphs will be formed to make the summary.
Mind map- The story of  "The Cat and the Pain-Killer":
 
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