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Re: The idea to use Navajo for secure communications came from P [#permalink]
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You are perfectly right about the meaning of empirical: which means actually: having proves.

However, if you read the following sentences after the OA

Quote:
Its syntax and tonal qualities, not to mention dialects, make it unintelligible to anyone without extensive exposure and training. It has no alphabet or symbols and is spoken only on the Navajo lands of the American Southwest. One estimate indicates that fewer than 30 non-Navajos, none of them Japanese, could understand the language at the outbreak of World War II.


You do have.
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Re: The idea to use Navajo for secure communications came from P [#permalink]
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You are perfectly right about the meaning of empirical: which means actually: having proves.

However, if you read the following sentences after the OA

Quote:
Its syntax and tonal qualities, not to mention dialects, make it unintelligible to anyone without extensive exposure and training. It has no alphabet or symbols and is spoken only on the Navajo lands of the American Southwest. One estimate indicates that fewer than 30 non-Navajos, none of them Japanese, could understand the language at the outbreak of World War II.


You do have.


I apologize, I'm still confused with this.

Please clear up where I am wrong: Discussion of syntax, tonal qualities, dialect, lack of an alphabet/symbols, prevalence (geographic or not) aren't observable/based on experience (they are just facts that allow us to logically conclude something). And even if they were empirical, the OA should be one of these sentences--not the sentence before it.

The way I read it, it appears the 'test' that was set up allowed them to observe/experience the effects first-hand, which is why I chose that sentence.
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Re: The idea to use Navajo for secure communications came from P [#permalink]
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Empirical: derived from or guided by experience or experiment.

And all those elements such as symbols or alphabet are derived from experience......these are "empirical.
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Re: The idea to use Navajo for secure communications came from P [#permalink]
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The discussion is located here with an updated version of the passage and questions

https://gre.myprepclub.com/forum/the-id ... ml#p115814

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