My try: What ... for = Why This is a common structure. Try to remember this.
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EagerSeekerWhat did you do that for?= For what [reason / purpose] did you do that? = Why did you do that?
EagerSeeker
Doll
The second for is the same with the first for in the second sentence.
...the numbers are used for counting and for when they are used as labels. (You can change this for being used as labels to see the parallelilsm)CalifJim = Intermediate numbers are read differently depending on their use. Their typical naming