第三拍时，三条指令各走到哪
运行下面这段程序，填写它打印出来的结果。
STAGES = ["取指", "译码", "执行", "访存", "写回"]
cycle = 3
out = []
for i in range(3):
k = cycle - 1 - i
if 0 <= k < len(STAGES):
out.append(STAGES[k])
else:
out.append("未开始")
print("/".join(out))
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