[tag=DT] [lemma=system] □
[tag=DT] [lemma=system] [□]
[tag=DT] [lemma=system] (□ | □)
The protocol works this way on the theory that each system knows how much data it can accept without getting overrun . In this case , the system knows that the title is shown during the examples , even when this is not explicitly specified by the transformation rules .