Glad you're ready to go further Grouping not always "doesn't make sense". Say, you can "ungroup" at any time, but you can't un-combine (only undo), so be sure you're working on a duplicate! Also resulting figure gets attributes of the frontmost object, all others are gone. Combine won't work on grouped objects, too, so you must ungroup them first. Another thing, often all those steps I showed can be skipped - if you need only the final result - just ungroup everything, patch holes (or leave it), select all, combine. Especially when the figures are simple. And the last: there's even the script which does this job, but no need to bother for the one-time thing, I guess.
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