Suppose the atoms in a two-dimensional crystal have the following arrangement: 
On the drawing above, sketch the unit cell of this crystal.
Definitions:
Market Efficiency
A concept that describes how well prices in financial markets reflect all available and relevant information.
Insider Information
Private knowledge about a public company that could provide a financial advantage in the stock market if it were made public.
Insider Trading
The illegal practice of trading on the stock exchange to one's own advantage through having access to confidential information.
Financial Markets
Systems or platforms enabling investors to trade financial instruments such as stocks, bonds, and currencies with each other.
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