Pick an arbitrary subset.
an object
number of entries [-1 ⇒ any]
random number generator ([0, 1))
{[kᵢ, vᵢ], [kⱼ, vⱼ], ...} | [kᵢ, vᵢ], [kⱼ, vⱼ], ... ∈ x; |{[kᵢ, vᵢ], [kⱼ, vⱼ], ...}| = |x| if n<0 else n
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Pick an arbitrary subset.