Almost all of it. First tie the ropes together at the ends. then climb one of the ropes. Tie a loop in the rope as close to the ceiling as possible. Hang from the loop, then cut the rope just below it (but don't drop it, or you'll be stuck on the ceiling). Run the rope through the loop and tie it to your waist. Swing over to the other rope and pull the rope that's going through the loop tight. Cut the other rope as close as possible to the ceiling, holding tight to the end of it. Once the rope is loose, you will swing down below the loop. Let yourself down to the ground by letting the rope out. At the bottom, untie yourself and pull the rope completely through the loop. At this point you'll have all of the rope except what was used to tie the loop.
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