Obtain entries present in both lists.
x ∩ y = {[kᵢ, vᵢ] | [kᵢ, vᵢ] ∈ x and [kᵢ, vᵢ] ∈ y}
lists
another lists
combine function (a, b)
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Obtain entries present in both lists.
Returns
x ∩ y = {[kᵢ, vᵢ] | [kᵢ, vᵢ] ∈ x and [kᵢ, vᵢ] ∈ y}