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Dr. Charles Frederick Ehret F. Ehret, 83, a senior scientist emeritus at Argonne National Laboratory, near Lemont, whose pioneering research led to the development of a popular diet to combat the effects of jet lag, died Saturday, Feb. 24, at his home in Grayslake , from natural causes. After his book came out he received calls from all over--people planning trips for everyone from President Ronald Reagan to the rock band Aerosmith, said his son John.
 place of death: Charles Frederick Ehret, Grayslake
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: place of death, place of birth, education degree, education institution 
Text: {0} 
Answer:
 place of death: Charles Frederick Ehret, Grayslake