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If you have struggled to get someone at the IRS to answer your tax questions — either on the phone or at an IRS office — Saturday may be your big chance. On March 12, Taxpayer Assistance Centers in more than 30 cities will offer face-to-face help without an appointment. These local IRS offices typically are closed on weekends but will be open this Saturday from 9 a.m. to 4 p.m. So…