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4. Property and Equipment (Tables)
9 Months Ended
Sep. 30, 2019
Property and equipment:  
Property and equipment
   September 30, 2019   December 31, 2018 
Property and equipment, purchased  $258,000   $258,000 
Property and equipment, leased   30,089    30,089 
    288,089    288,089 
Less: accumulated depreciation   (114,338)   (71,125)
Property and equipment, net  $173,751   $216,964