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White aircraft contrail split across clear blue sky, possibly due to atmospheric variation or flight maneuver.
Back blows (the Heimlich maneuver or Heimlich manoeuvre) on a simulation mannequin infant dummy during medical training Basic Life Support
Helicopters performing an aerial maneuver in formation against a partly cloudy blue sky.
Armored personnel carrier infantry fighting vehicle. Military background with copyspace.
A young woman learning how to do the Heimlich maneuver which is used in case of choking. (Step 1)

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