
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. 
</s>
<m> polygamy </m> in The arrests of Winston K. Blackmore, 52, and James Oler, 44, on charges of polygamy were the culmination of the most recent seven-month charge assessment review by special prosecutor Terrence Robertson. Last June, Oppal hired Robertson to investigate whether charges should be laid against the openly polygamist members of the Bountiful commune, where older men routinely are married, legally and common-law, to much younger women. 