code: def dot(self, other):
          
          dot_product = 0
          a = self.elements
          b = other.elements
          a_len = len(a)
          b_len = len(b)
          i = j = 0
  
          while i < a_len and j < b_len:
              a_val = a[i]
              b_val = b[j]
              if a_val < b_val:
                  i += 2
              elif a_val > b_val:
                  j += 2
              else:
                  dot_product += a[i + 1] * b[j + 1]
                  i += 2
                  j += 2
  
          return dot_product
docs: Calculates the dot product of this vector and another vector.