
Are the following mentions coreferent?:
<m> Polygamy </m> in Warren Jeffs Trial : Defends 'Spiritual' Marriage, Polygamy 
</s>
<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. 