21680
In 1956 , when Britain , France and Israel invaded Egypt to seize the Suez Canal , Arab producers cut off supplies to Europe .
 1956, Britain, France, Israel, Egypt, Arab, Europe
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 1956, Britain, France, Israel, Egypt, Arab, Europe