Subgroup of $S_8$ generated by $(1423)(5867)$ and $(1728)(3546)$

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Let $H$ be the subgroup of the symmetric group $\mathcal{S}_{8}$ generated by the permutations $a=(1423)(5867)$ and $b=(1728)(3546)$.

How can I identify $H$?

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Here is an elementary method which should work in this particular case.

First list all the elements of $H$ and find some useful relations among them. Fortunately, $|H|$ is not too large. You should also check whether $H$ is commutative or not. Then you could look at wikipedia to find out the list of all groups of order $|H|$. There are still several of them, but it is a good opportunity to learn about these groups. Then you should be able to recognize your group and solve your problem.