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  X   s  $    U$ )a  Retrieve the kerning value (if any) between a pair of elements.

The elments can be either individual glyphs (by name) or kerning
groups (by name), or any combination of the two.

Args:
  pair:
      A tuple, in logical order (first, second) with respect
      to the reading direction, to query the font for kerning
      information on. Each element in the tuple can be either
      a glyph name or a kerning group name.
  kerning:
      A dictionary of kerning pairs.
  groups:
      A set of kerning groups.
  fallback:
      The fallback value to return if no kern is found between
      the elements in ``pair``. Defaults to 0.
  glyphToFirstGroup:
      A dictionary mapping glyph names to the first-glyph kerning
      groups to which they belong. Defaults to ``None``.
  glyphToSecondGroup:
      A dictionary mapping glyph names to the second-glyph kerning
      groups to which they belong. Defaults to ``None``.

Returns:
  The kerning value between the element pair. If no kerning for
  the pair is found, the fallback value is returned.

Note: This function expects the ``kerning`` argument to be a flat
dictionary of kerning pairs, not the nested structure used in a
kerning.plist file.

Examples::

  >>> groups = {
  ...     "public.kern1.O" : ["O", "D", "Q"],
  ...     "public.kern2.E" : ["E", "F"]
  ... }
  >>> kerning = {
  ...     ("public.kern1.O", "public.kern2.E") : -100,
  ...     ("public.kern1.O", "F") : -200,
  ...     ("D", "F") : -300
  ... }
  >>> lookupKerningValue(("D", "F"), kerning, groups)
  -300
  >>> lookupKerningValue(("O", "F"), kerning, groups)
  -200
  >>> lookupKerningValue(("O", "E"), kerning, groups)
  -100
  >>> lookupKerningValue(("O", "O"), kerning, groups)
  0
  >>> lookupKerningValue(("E", "E"), kerning, groups)
  0
  >>> lookupKerningValue(("E", "O"), kerning, groups)
  0
  >>> lookupKerningValue(("X", "X"), kerning, groups)
  0
  >>> lookupKerningValue(("public.kern1.O", "public.kern2.E"),
  ...     kerning, groups)
  -100
  >>> lookupKerningValue(("public.kern1.O", "F"), kerning, groups)
  -200
  >>> lookupKerningValue(("O", "public.kern2.E"), kerning, groups)
  -100
  >>> lookupKerningValue(("public.kern1.X", "public.kern2.X"), kerning, groups)
  0
Nzpublic.kern1.zpublic.kern2.)items
startswithget)pairkerninggroupsfallbackglyphToFirstGroupglyphToSecondGroupgroupgroupMembersglyphfirstsecond
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