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When Walt Whitman wrote the words “I am large, I contain multitudes,” he was embracing a truism: Even the dullest among us have a multiplicity of selves. We house contradictions. We are more than the span between our hats and our boots. This idea, so exhilarating to the poet, is a goad and a torment to the teenage narrator of John Green’s long-awaited young-adult novel “Turtles All the Way Down” (Dutton, 286 pages, $19.99). The book is Mr. Green’s first since “The Fault in Our Stars” (2012), a work that enraptured adolescent readers and many adults, too, with its sensitive, stylish, heartbreaking portrait of a doomed…