Naeoegibeop
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The fourth technique is called nae-oe-gi-beop (내외기법). Nae means inside, oe means outside. This tells us that this technique is an inside/outside technique, just like the first two techniques from the basic eight locks. The technique finishes with an inside/outside wrist lock.
Sometimes you see the nae-oe written with Chinese character: 內外기법.