This is a greeting that is acceptable for newspeech. It is especially useful because of its etymological root in Latin: it was a cry of despair. "Hey" therefore becomes especially useful in informing the people around you whether you are in a triggable mood. When in a pleasant mood, use ey.
Hello is etymologically problematic; therefore other more acceptable greetings are necessary.
Hey derives from Latin as "a cry of grief or fear."
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