What is the underlying rhythm in the ECG tracing shown here? 
Definitions:
Safety Roadblock
A barrier or measure implemented to enhance safety by preventing accidents or unsafe situations.
Seat Belt
A safety device in vehicles, designed to secure the occupant against harmful movement that may result during a collision or a sudden stop.
Bull's Eye
The center of a target, often used in the context of achieving precision or pinpoint accuracy.
Probability
A measure of how likely an event is to occur, expressed as a number between 0 and 1.
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