8756
Tablets of squares and cubes , calculated from 1 to 60 , have been found at Senkera , and a people acquainted with the sun-dial , the clepsydra , the lever and the pulley , must have had no mean knowledge of mechanics .
 Senkera
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Senkera