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Trefoil - Wikipedia
Trefoil Definition & Meaning - Merriam-Webster
TREFOIL | definition in the Cambridge English Dictionary
Clover - Wikipedia
TREFOIL Definition & Meaning | Dictionary.com
Trefoil | Encyclopedia.com
Trefoil Definition & Meaning | Britannica Dictionary
trefoil - Wiktionary, the free dictionary
Trefoil | Definition, Symbol & Architecture | Study.com
What is a Trefoil? (with pictures) - WiseGEEK