8.
The Second Discourse on the Course of Expression
218.
...Etc. He claims not to have seen what has been seen, claims not to have heard what has been heard, claims not to have sensed what has been sensed, claims not to have cognised what has been cognised... etc.
He claims to have seen what has been seen, claims to have heard what has been heard, claims to have sensed what has been sensed, claims to have cognised what has been cognised.
The eighth.