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一个列表使用turtle库的turtle.circle()函数、turtle.seth()函数和turtle.left()函数绘制一个四瓣花图形，效果如下图所示。请结合程序整体框架，补充横线处代码。import turtle as tfor i in range(4): t.seth(____________) t.circle(200, 90) t.left(90) t.circle(200, 90)【图片】
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