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