Could you please tell me the difference?
1- I don't know what books you like the most.
2- I don't know which books you like the most.
cat desk 1- I don't know what books you like the most. Of all the books in the world …. cat desk 2- I don't know which books you like the most.
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cat desk1- I don't know what books you like the most.
Of all the books in the world ….
cat desk2- I don't know which books you like the most.
Of all the books in the group of books you know I mean ….