Identification of a chain reaction

This can best be illustrated by arguing from a specific reaction. 

Question. A simplified mechanism for the gas phase decomposition of methox-ymethane, CH3OCH3, is as follows  

Identify the intermediates, stating which are chain carriers. Why is this a chain reaction  

Identify, giving reasons, the initiation, propagation and termination steps. 

giving reasons, which products are major and which minor. 

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