I am not sure if I read this correctly, but it seems that Derrida ended his work by identifying that there are only two systems of thought--the centered/total structure and the irrational/play structure.

What confuses me is the passage as a whole is about deconstructing ideas of totality and binaries. By saying that there are only two structures, that implies that there is no play and everything is fixed. He seems to be contradicting himself. How can all other systems be flexible except for these particular systems?