Order does matter:
$$\begin{align*} &1 2 3\\ &1 3 2\\ &2 1 3\\ &2 3 1\\ &3 1 2\\ &3 2 1 \end{align*}$$
Order doesn't matter:
$$1 2 3$$
How does this work? Order doesn't matter: $1 2 3$. Can't it also be say, $3 2 1$? Doesn't this also show that order doesn't matter.