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Sentence 4 foreshadows the absence of Doodle in the narrator's life.
Sentence 4 from the excerpt is foreshadowing that Doodle is no longer present in the narrator's life. The statement '...the grindstone begins to turn, and time with all its changes is ground away-and I remember Doodle' hints at the absence of Doodle in the narrator's current life, suggesting a tragic event occurred in the past.