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Please check out the attached image (last phrase of your choral), I hope it is useful to understand paralells and interval doublings.
The numbers are interval relations to the bass. Intervals greater than an octave are written like simple intervals (for eg. 5th instead of 12th).
And yes, you are right: moving from 12th to 12th counts as a paralell 5th, but moving from 5th to 12th or 12th to 5th are paralell 5ths, too.
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