new_contents: import sys
  import scipy.io as io
  import numpy
  
  inputs = sys.argv[1:-1]
  output = sys.argv[-1]
  d = {}
  
  for input in inputs:
      mat = io.loadmat(input)
      for k in mat:
          if k.startswith('_'):
              continue
          print(k)
          if k in d:
              d[k] = numpy.concatenate((d[k], mat[k]))
          else:
              d[k] = mat[k]
  
  io.savemat(output, d, appendmat=False)
  
subject: Add mergemats script