[gronglo]

My understanding is that there are no "rules", only relationships between words. I picture it as a vector pointing off into a cloud of related words. You can feed it terms that alter that vector and point it into a different part of the word cloud, but if enough of your other terms outweigh the original "instruction", the vector may get dragged back into a different part of the cloud that "disobeys" the instruction. Maybe an expert can correct me here.