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S22:E104 Elmo plays "Three of These Things"
First Aired: April 04, 1991
Big Bird looks in his mailbox, and to his surprise he finds a square. He goes outside to find out who it belongs to, and finds that Mike and Maria also have squares of their own which they got in the mail. Telly shows up, displaying the triangle he got in the mail, which confuses them further. Sponsors: J, O, 13
