What is the procedure to arm the ADT Safewatch Pro 3000 system in different modes?

To arm your system, enter your user code followed by the desired arming key. Press [2] for AWAY mode, [3] once for STAY mode, [3] twice for NIGHT-STAY mode, and [7] for INSTANT mode.

From the official ADT Safewatch Pro 3000 manual, page 14

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