definiens: shall mean the occurrence of any one or more of the following events ( regardlessof the reasons therefor ) ( a ) Parent ’s or Purchaser ’s failure to pay or discharge its obligations in full in accordance with theterms of the promissory note, ( b ) Parent ’s or Purchaser ’s failure to observe or perform any other material covenant, obligation, A-6condition or agreement contained in the promissory note which failure remains unremedied for more than thirty ( 30 ) days afterwritten notice of such failure has been delivered to Parent or Purchaser, ( c ) the commission of any act of bankruptcy by Parentor Purchaser, the execution by Parent or Purchaser of a general assignment for the benefit of creditors, the filing by or againstParent or Purchaser of a petition in bankruptcy or any petition for relief under the federal bankruptcy act and the continuationof such petition without dismissal for a period of ninety ( 90 ) days or more, or the appointment of a receiver or trustee to takepossession of the property or assets of Parent or Purchaser, or ( d ) the liquidation, dissolution or winding up of Parent orPurchaser, whether voluntary or involuntary