#define t(x,y,z) x ## y ## z
#define xxx(s) int s[] = { t(1,2,3), t(,4,5), t(6,,7), t(8,9,), \
        t(10,,), t(,11,), t(,,12), t(,,) };

int j[] = { t(1,2,3), t(,4,5), t(6,,7), t(8,9,),
	t(10,,), t(,11,), t(,,12), t(,,) };
xxx(j)