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ACROSS
1)  a chemical sprayed on fruit trees to regulate their growth so the entire crop can be harvested at one time
2)  a short note recognizing a source of information or of a quoted passage
3)  a visual representation (of an object or scene or person or abstraction) produced on a surface
4)  a visual presentation showing how something works


DOWN
1)  any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt
2)  a similar kind
3)  (physics and chemistry) the smallest component of an element having the chemical properties of the element
4)  a city in western nevada at the foot of the sierra nevada mountains; known for gambling casinos and easy divorce and remarriage

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