"The corner of a book ──► ?", Perpendicular lines, "The letter 'L' ──► ?", Perpendicular lines, "The letter 'X' ──► ?", Not perpendicular lines, "A crossroad/intersection shape '+' ──► ?", Perpendicular lines, "The top and side of a door ──► ?", Perpendicular lines, "The hands of a clock at 5 o'clock ──► ?", Not perpendicular lines

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