
Are the following mentions coreferent?:
<m> announced </m> in RBC Capital Markets downgraded ATI Technologies to sector perform from outperform after Advanced Micro Devices announced its intention to buy the Canadian graphics chip-maker for $ 5.4 billion on Monday. 
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<m> said </m> in Hector Ruiz, chairman and chief executive of AMD, said that together they intend to create a processing powerhouse. 