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Dear _______________,
Thank you for joining my family up in the stands during my graduation commencement ceremony. You are a wonderful friend and a very important part of my life. It warms my heart that you were there to help me celebrate my graduation. I could actually hear all of you screaming my name as I crossed the stage. So impressive! Thank you also for the thoughtful graduation gift. I really appreciate it!
Very fondly,
– (Your Name Here)