Association Lists
lAn association list is a list of pairs.
[[ÒJanuaryÓ, 31], [ÒFebruaryÓ, 28], [ÒMarchÓ, 31], [ÒAprilÓ, 30]]
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lTypically all first elements of the pairs are of the same type, and all second elements are of the same type.
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lThe pairs are not necessarily of the same type as each other.