It seems like you've listed two sets, $P$ and $Q$. Let's clarify and analyze these sets:

1. Set $P$: $\{-2, -1, 0, 1, 2\}$
2. Set $Q$: $\{0, 2, 4\}$

Possible Operations and Relationships:

1. Union ($P \cup Q$): All elements from both sets without duplication.
2. Intersection ($P \cap Q$): Common elements between the sets.
3. Difference ($P - Q$): Elements in $P$ that are not in $Q$.
4. Symmetric Difference ($P \Delta Q$): Elements in either $P$ or $Q$, but not in both.
5. Cartesian Product ($P \times Q$): Pairs of elements where the first element is from $P$ and the second from $Q$.

Would you like me to compute any specific operation or provide details on how to perform these operations?

Related Questions:

1. What is the union of $P$ and $Q$?
2. What is the intersection of $P$ and $Q$?
3. What is the difference $P - Q$?
4. What is the symmetric difference $P \Delta Q$?
5. What is the Cartesian product $P \times Q$?

Tip: The intersection of two sets helps identify common elements, which can be particularly useful in comparing groups or data sets!