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

	>>> 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.)ÚitemsÚ
startswithÚget)ZpairZkerningÚgroupsÚfallbackZglyphToFirstGroupZglyphToSecondGroupÚgroupZgroupMembersZglyphÚfirstÚsecondZ
firstGroupZsecondGroupZpairs© r
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