Document B (Nov 2010) is the original police contract approval; Document A (Apr 2011, 171 days later) approves a revised version of that same contract—two separate board actions on the same underlying instrument, not a literal revision of one document.
Two separate contract approvals 182 days apart; the 2010 document approves an initial contract and the 2011 document approves a revised version, making them distinct board actions on successive iterations rather than a single document revision.
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Document B approves the initial contract; Document A amends it 291 days later—two separate board actions on the same underlying agreement, not a revision of the same decision.