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Get the `unit` identifier of **coordinate**, if **coordinate** has a valid
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Calculate top-left corner of a rectangle.
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:param 2-tuple insert: insert point
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:param string pos: insert position ``'vert-horiz'``
:return: ``'top-left'`` corner of the rect
:rtype: 2-tuple
========== ==============================
pos valid values
========== ==============================
**vert** ``'top | middle | bottom'``
**horiz** ``'left'|'center'|'right'``
========== ==============================
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