{HEAD ~ The training apparatus} 1 wherein each of said at least one transceiver is {TAIL ~ an ultrasonic transceiver} and each of said at least one reflector is an ultrasonic reflector 
{ HEAD ~ The training apparatus } 1 wherein each of said at least one transceiver is { TAIL ~ an ultrasonic transceiver } and each of said at least one reflector is an ultrasonic reflector
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