Pins 3, 4, 5 are digital output's. They get their power directly from the pins which is delivered to the anode of the LED's. A resistor is then placed between the cathode of the LED and the ground rail. In the previous starter kit project, the resistors came before the LED, I am guessing to prevent the LED receiving too much electricity. In this project, why do the resistors come after the LED? What part of the circuit are they protecting? Thank You.