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To
General
Business
Philosophy
Technology & Computers
Medicine
Primary
Military
Arts
Translation
Entertainment
Geography
Law
Arabic & Islamic Encyclopedias
Education
abacus ˈæbəkəs  [ab·a·cus]
 
_(plural) abacuses or abaci /ˈæbəsai/ n
أَداةٌ للعَدِّ، مِعْداد