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0. Consider the following nested representation of binary trees indicates y and z are the left right subtrees, respectively, of node x. Note that y and z may be NULL or further nested. Which of the following represents a valid binary tree ?
(1 2(4 5 6 7))
1((2 3 NULL)4 5 6)7)
(1(234)(567)
(1(2 3 NULL)(4 5))
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