Remove first n entries (default order).
an object
number of entries [1]
{[kₙ, vₙ], [kₙ₊₁, vₙ₊₁], ...} | [kᵢ, vᵢ] ∈ x and |{[kₙ, vₙ], [kₙ₊₁, vₙ₊₁], ...}| ≤ max(|x| - n, 0)
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Remove first n entries (default order).