RACE PROBLEM

\ɹˈe͡ɪs pɹˈɒbləm], \ɹˈe‍ɪs pɹˈɒbləm], \ɹ_ˈeɪ_s p_ɹ_ˈɒ_b_l_ə_m]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd