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Webster's Dictionary & Thesaurus with Full Color Atlas, Third Edition
Abacus - HandWiki
Abacus - Wikipedia
Abacus - Wikipedia
Villi. An irregular plural… but not of villa, by Avi Kotzer, Silly Little Dictionary!
abacus - Wiktionary, the free dictionary
Merriam-Webster English Dictionary
Merriam Webster's: Pocket Dictionary – BookXcess
Abacus Meaning : Definition of Abacus
The Merriam-Webster Dictionary – مكتبة نيويورك الكويت