Grid systems were used in ancient greece and china in order to what ?

- "schenck v. united states, case in which the u.s. supreme court ruled on march 3, 1919, that the freedom of speech protection afforded in the u.s. constitution's first amendment could be restricted if the words spoken or printed represented to society a “clear and present danger.” "

- speech aimed to potentially create danger could be banned.

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- "it was a failure that was an embarrassment for the kennedy administration."

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can you list the answers so i can answer the question