<Li> (1, 2, 3, 4) ⊆ (1, 2, 3, 4). </Li> <P> The empty set is a subset of every set and every set is a subset of itself: </P> <Dl> <Dd> <Ul> <Li> ∅ ⊆ A . </Li> <Li> A ⊆ A . </Li> </Ul> </Dd> </Dl> <Dd> <Ul> <Li> ∅ ⊆ A . </Li> <Li> A ⊆ A . </Li> </Ul> </Dd>

Identify the sets that contain 2 as an element