Hinge equivalent to RUvULvRmUvUmUv
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It can be obtained directly as follows
<ul>
<li>Start from RRmDRmRvLmDvDm
<li>Rotate 90 degrees the two adjacent vertical tiles at the boundary of the bounding box against
other two (horizontal) tiles
<li>Change the hinging side of both the rotated tiles and open slightly into the final shape
</ul>
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