A clef (from French: clef “key”) is a musical symbol used to indicate the set of pitches of written notes.

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Why is the bass clef indicated twice on the same line in this Bartok piece?

Here's an excerpt from the piece Chromatic Invention from Bartok's Mikrokosmos, volume 3, page 39. I don't get why at the end of the lower line the bass clef indication is repeated. Is this "for ...
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Why transpose at the octave?

If an instrument has a range too high or too low for composers to easily write its music on bass or treble clef, the music may be written either an octave higher or an octave lower than it sounds, ...