Design a circuit in which you have 14 leds lined up in a straight line. the leds should light up, one at a time, in order starting from left to right. when the light reaches the end (the 14th led), they should reverse order and light up in order, one at a time, from right to left. when the light reaches the beginning (the 1st led), the circuit should loop and and continue to light up from left to right and so on forever.