第三拍时，三条指令各在哪一级
运行下面这段程序，填写它打印出来的结果。
STAGE_NAMES = ["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(STAGE_NAMES):
out.append(STAGE_NAMES[k])
else:
out.append("空")
print("/".join(out))
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