If you want to allow the empty list then: “∀x y. MEM x l ∧ MEM y l ⇒ x = y”
or: “∃x. set l ⊆ x”. or: “∃x. MEM y l ⇒ y = x”. -- Do not eat animals; respect them as you respect people. https://duckduckgo.com/?q=how+to+(become+OR+eat)+vegan
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