RULE OF GRAMMAR

\ɹˈuːl ɒv ɡɹˈamə], \ɹˈuːl ɒv ɡɹˈamə], \ɹ_ˈuː_l ɒ_v ɡ_ɹ_ˈa_m_ə]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd