
Are the following mentions coreferent?:
<m> polygamy </m> in Two top leaders of the controversial polygamous sect in Bountiful, B.C., have been arrested and charged with practising polygamy. Oppal said in 2005, when he was appointed attorney general, that he was concerned about the polygamy issue in Bountiful because of the exploitation of women and children. 
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<m> polygamy </m> in Two leaders of polygamous groups with ties to Utah have been arrested in Canada, charged with practicing polygamy. The prosecutor recommended polygamy and sexual exploitation charges but British Columbia attorney general Wally Oppal opted to only pursue polygamy charges. 