Push the big accelerator lever thingy away from you and GD2 will surge forward with great gusto. Pull it towards you and by a process of fluid mechanics and thermodynamics the accelerator thingy becomes a brake and GD2 will vibrate comfortingly to a stop.
It may not always happen quite as above but if stoichiometric combustion conditions are favourable and Tmax is in good form you have a plan.
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