Pull the burin backward to hook some wood-fiber. Then, pick up and
peel the wood-fiber out of the tree to complete Si-Diao process.
When using the Burin E, the region 90 degree extended from the burin
edge is a dangerous area as indicated in Fig. 1. Nothing can be
left in the dangerous area except the burin has stopped carving (Fig.
2). Hold the burin to hook the wood, and pull the burin backward
to raise some wood-fiber (Fig. 3). Then, clamp the lifted fiber
by another thumb in order to pull up and peel the fiber along the grain
of the wood (Figs. 4~6). Sometimes, sharp-nose pliers can be used
for peeling the fiber.