YOU, annalex, were the one who claimed "That is clearly a heresy. Man cannot cooperate with grace". I showed you in your own Catechism that Catholic teaching IS that man cooperates with grace. Before we go any further, would you like to issue a retraction or admit you were incorrect?
I should have been clearer. Man cannot produce grace: he cannot cooperate with God sending grace down. That is what I should have said in application to semi-Pelagianism.
The Catechism says that man must cooperate with grace in the realm of his own works; for example, once in a state of grace a Catholic man can undertake the good work of explaining the scripture to non-Catholics. That is of course true: this is why Sola Fide is a false doctrine.
These were two meanings of “cooperate” that I had to better distinguish between.