The four lights form a stage lantern as shown in the figure, and the color of the lights changes every 30 seconds. The first time the upper and lower lights exchange colors, the second time the left and right lights exchange colors, and the third time the upper and lower lights Swap colors, ..., and so on. May I ask how to arrange the colors of the four lights when the lights are turned on for 1 hour?
四盏灯如图所示组成舞台彩灯，且每30秒钟灯的颜色改变一次，第一次上下两灯互换颜色，第二次左右两灯互换颜色，第三次又上下两灯互换颜色，…，这样一直进行下去．请问开灯1小时四盏灯的颜色如何排列？
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