strange GCC system include search order

["Stephen C. Biggs" <s_c_biggs at bigfoot dot com>]

$ gcc --verbose -c foo.cpp
Reading specs from /usr/lib/gcc-lib/i686-pc-cygwin/2.95.2-5/specs
gcc version 2.95.2-5 19991024 (cygwin experimental)
 /usr/lib/gcc-lib/i686-pc-cygwin/2.95.2-5/cpp.exe -lang-c++ -v -D__GNUC__=2 -D__GNUG__=2 -D__GNUC_MINOR__=95 -D__cplusplus -Di386 -D__386__ -D__i386 -D_X86=1 -D__STDC__=1 -D__stdcall=__attribute__((__stdcall__)) -D__cdecl=__attribute__((__cdecl__)) -D__d
eclspec(x)=__attribute__((x)) -D__i386__ -
D__386__ -D__i386 -D_X86=1 -D__STDC__=1 -D__stdcall=__attribute__((__stdcall__)) -D__cdecl=__attribute__((__cdecl__)) -D__declspec(x)=__attribute__((x)) -D__i386 -Asystem(winnt) -Acpu(i386) -Amachine(i386) -D__EXCEPTIONS -remap -Acpu(i386) -Amachine(i386
) -Di386 -D__i386 -D__i386__ -Di686 -
Dpentiumpro -D__i686 -D__i686__ -D__pentiumpro -D__pentiumpro__ -D__CYGWIN32__ -D__CYGWIN__ -Dunix -D__unix__ -D__unix -D_WIN32 -DWINNT -isystem /usr/include/w32api list.cpp /cygdrive/d/TEMP/ccMqhWEd.ii
GNU CPP version 2.95.2-5 19991024 (cygwin experimental) (80386, BSD syntax)
#include "..." search starts here:
#include <...> search starts here:
 /usr/include/w32api
 /usr/lib/gcc-lib/i686-pc-cygwin/2.95.2-5/../../../../include/g++-3
 /usr/lib/gcc-lib/i686-pc-cygwin/2.95.2-5/../../../../include
 /usr/include
 /usr/lib/gcc-lib/i686-pc-cygwin/2.95.2-5/include
 /usr/include
End of search list.
The following default directories have been omitted from the search path:
End of omitted list.
 /usr/lib/gcc-lib/i686-pc-cygwin/2.95.2-5/cc1plus.exe /cygdrive/d/TEMP/ccMqhWEd.ii -quiet -dumpbase list.cc -version -o /cygdrive/d/
TEMP/ccmttK3W.s
GNU C++ version 2.95.2-5 19991024 (cygwin experimental) (i686-pc-cygwin) compiled by GNU C version 2.95.2-5 19991024 (cygwin experimental).
 as -o list.o /cygdrive/c/TEMP/ccmttK3W.s


Here is my output for gcc --verbose.

Why is "/usr/include" in there twice?

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