Four friends (Peter, Quinn, Rachel, Sam) sat in a movie theater in a row containing seats, numbered to from left to right. During the movie Peter went to the lobby to get some popcorn. When he returned, he found that Quinn had moved one seat to the right, Rachel had moved one seat to the left, and Sam had stayed in his seat, leaving a seat next to an end seat for Peter. In which seat had Peter been sitting before he got up?
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4
