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Young Mary Lennox is orphaned by an earthquake in India and sent to England to live with her uncle in a cold ancestral manor in Yorkshire. Mary briefly meets him, still mourning for his wife who died ten years ago, but she is mostly left on her own. A resourceful and inquisitive girl, she soon makes two exciting discoveries. First she finds an overgrown secret garden, the favorite of her aunt and locked up since her death. Second, that she has a cousin, Colin, a sickly boy who has been told he must remain in bed out of the daylight at all times. Once Mary and another new friend, Dickon, have brought the garden back to life they decide Colin must see it, a decision that will change several lives.
Answer:
First, a quick introduction.
Unrestricted thesis is a vary broad thesis that doesn't provide one clear topic to debate on.
Unlike this, restricted thesis is the one that is much more specific and narrower.
"Classical music is the basis for most rock music" leaves us on a to broad field for debate. There are countless ways this can be revised into restricted thesis. One can be more specific about what aspect of classical music, or which composer provided this basis. Also one could be more specific about genres of rock influenced by classical music etc.
For example, one of the possible revisions could be:
Mozart's chord progression provided a pattern that influenced classic rock bands.
This is now much more specific topic (restricted thesis) for debate.