SYSTEM OF RULES

\sˈɪstəm ɒv ɹˈuːlz], \sˈɪstəm ɒv ɹˈuːlz], \s_ˈɪ_s_t_ə_m ɒ_v ɹ_ˈuː_l_z]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd