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2. Liquidity (Tables)
6 Months Ended
Jun. 30, 2020
Liquidity  
Restricted cash

Effective Date

 

Expiration Date

  June 30, 2020     December 31, 2019  
July 9, 2019   July 8, 2020   $ 150,000     $ 150,000  
January 8, 2020   January 7, 2021     400,000       ––  
April 6, 2020   April 6, 2021     250,000       ––  
Total       $ 800,000     $ 150,000