Seven bays are arranged in a circle and numbered 1 to 7 in the clockwise direction. Four drones — Wisp, Xenon, Yara and Zephyr — rest on four of the seven bays; the other three bays are empty. On each turn the drone whose turn it is moves either clockwise or anticlockwise (its own choice) and lands on the FIRST empty bay reached in the chosen direction. The turns occur in this order: Wisp (Turn 1), Xenon (Turn 2), Yara (Turn 3), Zephyr (Turn 4), Wisp (Turn 5), Xenon (Turn 6), Yara (Turn 7). "Four consecutive bays" means four bays whose numbers are consecutive around the circle (e.g., 6,7,1,2). In the STARTING position (before Turn 1): Xenon and Yara rest on two adjacent bays, while each of Wisp and Zephyr has an empty bay on both of its sides. The following is known. 1. The four drones occupy four consecutive bays ONLY at the end of Turn 3 and at the end of Turn 5 (and at no other time, including the start). 2. Zephyr is on Bay 6 after Turn 1 and on Bay 5 after Turn 5; Yara is on Bay 3 after Turn 2.
Which bay was initially occupied by Xenon (before Turn 1)?