Let $S$ be a set, that is, a collection of objects.

We say that an object $x$ is __an element of $S$__ if $x$ is a member of this collection.

We write $x\in S$ when $x$ is an element of $S$ (not to be confused with the Greek letter $\epsilon$ (epsilon)),

and $x\not\in S$ when $x$ is not an element of $S$.

For which of the following sets $S$ is the word "Seven'' **NOT** an element of $S$, that is, Seven $\not\in S$:

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