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[4, 5, 6, 7, 8, 9, 10]
⟅4, 5, 6, 7, 8, 9, 10⟆
{4, 5, 6, 7, 8, 9, 10}
⟅2 # 2, 4⟆
[4, 5, 6, 7, 8, 9, 10, 11, 12, 13]