From what cause I, of course, cannot say.Of course, from what...

From what cause I, of course, cannot say.
Of course, from what cause I cannot say.
Of course, I cannot say from what cause.
From what cause, of course, I cannot say.
I cannot say from what cause, of course.
From what cause I cannot, of course, say.
From what cause I cannot say, of course.
I cannot say, of course, from what cause.