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By William James LONDON (Reuters) - Lawyers for former Pakistan president Pervez Musharraf on Friday appealed to the United Nations to intervene and help prevent him being tried for treason, saying he faced a "show trial". Musharraf's case, initiated by the Pakistani government, focuses on accusations that the former military leader breached the constitution when he imposed emergency rule in 2007. Musharraf's trial is due to begin on December 24. His plea, issued from London by an international legal team, is designed to get the United Nations to urge Nawaz Sharif, Pakistan's prime minister, to delay or stop it.