What is the relationship between concentration and nine in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

To summarize, through this agreement, we created a Master Lease structure which reduces our risk in the event of restructuring, extended our average lease term by nine years and we've given ourselves the option to reduce our concentration to AMC, by transitioning seven theaters.
original_broadcaster