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/usr/share/auto-complete/dict/c-mode is in auto-complete-el 1.3.1-2.

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auto
_Bool
break
case
char
_Complex
const
continue
default
do
double
else
enum
extern
float
for
goto
if
_Imaginary
inline
int
long
register
restrict
return
short
signed
sizeof
static
struct
switch
typedef
union
unsigned
void
volatile
while