What Is the Addition of Subject in Structured Linguistics?

U so sur has a system of pure differences with no subject in it. When laconde defines signifier, he immediately defines it in relation to subject. That is, it represents the subject for another signifier. And i think that's the crucial thing that he adds to sesseur. It's as if subject is this thing subtracted from the field of signifiers. So subject is there as an absence, and the signifier represents the subject as what is not there. No matter what the signifier i chose, i chose brother, i chose cousin talking to you, i chose friend, whatever i chose,. Like whatever i chose, I'm i'm in that signifier as