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/usr/share/source-highlight/style.defaults is in libsource-highlight-common 3.1.6-2ubuntu1.

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# defaults for styles
# the format is:
# elem1 = elem2
# meaning that if the style for elem1 is not specified, 
# then it will have the same style as elem2

classname = normal
usertype = normal
preproc = keyword
section = function
paren = cbracket
attribute = type
value = string
predef_var = type
predef_func = function
atom = regexp
meta = function
path = regexp
label = preproc
error = string
warning = type
code = preproc