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Just down the hall from the firing range, is a mostly un-used classroom with cold war era maps on the walls, and a large wooden desk at the front next to a chalkboard filled with a complicated series of equations. Jack sometimes notices Alex standing in the room, staring at the equations, trying to make sense of them.
Some time in January of 2000 the blackboard is wiped clean.
But sometimes as Suzie wanders the Hub late at night, she sees Jack standing in that room, staring at an empty blackboard, and running a shiny metal chain through his fingers.