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# µû¶óÇÏ¸ç ¹è¿ì´Â ÆÄÀ̽ã°ú µ¥ÀÌÅÍ°úÇÐ(»ý´ÉÃâÆÇ»ç 2020)
# 5.8 ÀÏÁ¤ÇÑ È½¼ö ¹Ýº¹¿¡ while »ç¿ëÇϱâ, 129ÂÊ
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import turtle
t = turtle.Turtle()
i = 0
while i < 4:
t.forward(100)
t.right(90)
i = i + 1
turtle.done()