Hi Pete,
I suspect Pedro used F5 to indicate the ommission of the 3rd. (Power chord)
https://en.wikipedia.org/wiki/Power_chord
It appears that he used two endings (even though they're the same) so that the jump to coda would occur in the second trip through the verse. (from the 2nd ending) if it were a simple repeating section, the coda-jump would happen the first time.
)BOB
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