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The idea to use Navajo for secure communications came from Philip John [#permalink]
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EXPLENATION QUESTION #3

Sentence 9: Johnston staged tests under simulated combat conditions, demonstrating that Navajos could encode, transmit and decode a three-line English message in 20 seconds. This is the only sentence mentioning a study conducted to demonstrate the benefits of using Navajo.
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The idea to use Navajo for secure communications came from Philip John [#permalink]
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