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Conservation efforts in the 1950 s stabilised the population , but prey species declined again in the wake of the Iranian Revolution ( 1979 ) and the Iran–Iraq War ( 1980 – 1988 ) , leading to a significant contraction of the cheetah 's historical range in the region .
 Iranian Revolution, Iran–Iraq War
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 Iranian Revolution, Iran–Iraq War