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"That's it!” (3)

Ross

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3

6

eureka

(Other definitions for eureka that I've seen before include "Exultant cry" , "Archimedes's cry of discovery" , "Cry on a great discovery" , "Archimedes' cry of triumph as he ran naked through the streets of Syracuse?" , "Cry of triumph (at a discovery)" .)

I've seen this clue in The Wall Street Journal and the LA Times.
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