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## Output
Node: Keys
6379: ["120"]
6380: ["119", "110", "111", "114", "105", "115", "106", "107", "118"]
6381: ["102", "112", "103", "113", "104", "100", "101"]
6382: ["116", "117", "108", "109"]
First key from each node
["119", "102", "116", "120"]