1. The multi-output OR-FFL. In a multi-output C1-FFL with OR-gate logic at the Z promoters, transcription-factor X begins to be produced at a constant rate at time t=0. At time t=T, the production rate suddenly becomes equal to zero. Both X and Y concentrations start at 0. Signals SX and SY are present throughout. Plot the concentration vs. time of the downstream genes Z1, Z2, and Z3. What are the delays between genes? (Use logic input functions).