Viscoelastic and Viscoplastic Glucose Theory (VGT #25): Applying the Concepts of Viscoelasticity, Viscoplasticity and Perturbation Theories to Predict PPG Dataset and Waveforms for the Pre-Virus and Virus Periods Using the Total PPG Values as a Baseline Along with the Estimated PPG Relative Energy Levels in Both Time-Domain and Frequency-Domain Based on the GH-Method: Math-Physical Medicine (No. 605)