Octave mandos are usually tuned G - D - A - E one octave below a standard tuned mandolin. This puts them in the same range as a standard tuned guitar - the E is tuned the same as the high E on a standard tuned guitar. And of course there are 8 strings, so you have a pair of each. On my OM I use octave pairs of strings on the G, D and A courses.
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