“请分析上述代码的执行流程，输出一段标准的 Mermaid sequenceDiagram 代码。不要解释，只输出代码块。”
Current X-ray lasers require facilities that are kilometres long. A cavity-based set-up about 66 metres in length has been developed that uses highly reflective mirrors to enable the generation of high-intensity pulses of narrow-band X-ray radiation. This promises to overcome the limitations of current X-ray lasers.
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Late summer rain is causing havoc across Australia, with South Australia on flood watch, Victoria cleaning up after a downpour, and Sydney issuing a shark warning after heavy falls.
; IRETD — check if returning to V86 mode
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