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As they head to the polls for a special state election to fill the US House seat vacated by Senator Edward J. Markey, Winchester voters on Tuesday also will be asked to cast ballots in a special town election to decide on a proposed debt exclusion needed to fund a comprehensive overhaul of Winchester High School. The $129.9 million addition and renovation project is designed to address three issues for Winchester: increasing enrollment; an obsolete building infrastructure; and an educational program that is no longer supported by the physical layout of the high school. The Massachusetts School Building Authority on Oct. 2 approved up to $44.5 million to rebuild Winchester High School, leaving the town responsible for the balance of $85.4 million. If voters approve the debt exclusion, a temporary property tax increase that lasts until the project’s debt is paid off, town officials would complete work on the high school by fall 2017.