Rawi has N books to sell. The cost of the i'th book is c[] You, being a seeker of knowledge, want to bury some of Ravl's books.
Howover, Rav is a man of principles and he will only sell you the books If the set of books you want to
buy satisfy his condiltions
The set must contain at least two books
The total cost of all books from the set should be at least Rupees L and at most Rupees R.
The difference in the cost of the costliest and the cheapest of the chosen set of books must be at least x
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