Scheme of a mountain pass.
<a href="https://en.wikipedia.org/wiki/User:Paulbalegend" class="extiw" title="en:User:Paulbalegend">Paulba Legend</a> (<a href="https://en.wikipedia.org/wiki/User_talk:Paulbalegend" class="extiw" title="en:User talk:Paulbalegend">talk</a>)
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I created this work entirely by myself.