33956
It has been suggested that anoxic events caused or contributed to the Ordovician–Silurian , late Devonian , Permian–Triassic and Triassic–Jurassic extinctions , as well as a number of lesser extinctions ( such as the Ireviken , Mulde , Lau , Toarcian and Cenomanian–Turonian events ) .
 Devonian, Ireviken, Mulde, Lau, Toarcian, Cenomanian–Turonian
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Devonian, Ireviken, Mulde, Lau, Toarcian, Cenomanian–Turonian