code: def cascade(screenpos, i, nletters):  # noqa D103
      v = np.array([0, -1])
      d = lambda t: 1 if t < 0 else abs(np.sinc(t) / (1 + t**4))
      return lambda t: screenpos + v * 400 * d(t - 0.15 * i)
  
imports: import numpy
  from moviepy import *
  from moviepy.video.tools.segmenting import find_objects
label_desc: Use image node_id 2 for calling a global function with example usage: cascade(screenpos, i, nletters) and returns: function