Divide a round wooden stick into 4 sections of equal length, each section is painted with one of the three colors of red, yellow, and blue, and all three colors are used, how many different painting methods are there? (If two wooden sticks can be turned over to make the color order the same, then knowing two sticks is a kind of painting method)
把一根圆木棍分成等长的4节，每节用红、黄、蓝三中颜色的一种来涂，且三中颜色都要用上，共有多少种不同的涂法．(如果两根木棍可以经过翻转使得颜色顺序相同，那么认识者两根是一种涂法)
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