Branch Off
A mountain branch will branch off from the rest.
Picture this part of the mountain, branching off from the rest, into a mysterious path of its own.
き, ぎ
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If you want to branch off from your hiking group and explore this branch of the mountain, you need a special key (き). Just don't get caught down there or you'll get the guillotine (ぎ).
If you branch off from the beaten path, you need 1) access, and 2) to be really careful so you keep your head.