Determine whether this graph is planar. 
Definitions:
Required Rate Of Return
The minimum annual percentage earnings needed from an investment to make it worthwhile for the investor, considering the risk involved.
Investment
Assets or items acquired with the goal of generating income or appreciation in value over time.
Cash Flows
The total amount of money being transferred into and out of a business, considered essential for assessing the financial health of a business.
Project Ranking
The process of ordering projects by some criteria such as profitability, risk, or strategic value to prioritize investments and resource allocation.
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