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WASHINGTON — The IRS, is, in the strikingly harsh assessment of its own office of the national taxpayer advocate, “an institution in crisis.” A Globe review of dozens of government investigations of the IRS, along with interviews of key officials, shows a disturbing pattern. Year after year, the government’s top accountants and auditors – and the agency itself — report on the IRS’s failings. Yet year after year, many of the problems remain.