In the following game, how many Nash equilibria are there? 
Definitions:
Enforceable
Capable of being imposed or carried out by legal process or authority.
Single Promise
A commitment or agreement involving one clear and unambiguous obligation or stipulation.
Promissory Estoppel
Promissory Estoppel is a legal principle that prevents a person from going back on a promise, even if it wasn't formally made as a contract, provided others have relied on the promise to their detriment.
Property Manager
An individual or company responsible for the maintenance and operation of real estate properties, acting on behalf of the property owner.
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