Show the starting years shared by technicians from team "CLE" and "CWS".
SELECT Starting_Year FROM technician WHERE Team  =  "CLE" INTERSECT SELECT Starting_Year FROM technician WHERE Team  =  "CWS"
Team "CLE" ve "CWS" ten teknisyenler tarafından paylaşılan başlangıç ​​yıllarını gösterin.