New comments on your reply:

General remark:
  Different names are used for the same object we look for:
  "Majorana neutrino, 4th generation neutrino, Majorana particle,
  single 4th neutrino generation, on-shell heavy neutrino,
  single 4th generation Majorana neutrino, on-shell Majorana
  neutrino, higher mass neutrino".
  This is quite confusing. We should use once a full description
  like "single 4th generation on-shell Majorana neutrino" and
  for the rest use "Majorana neutrino" as in the title.

We don’t agree that this is confusing. In fact, we think it informative to the reader to use different descriptions.

New comment: So the different names are meant to add more information in the sentences
where they are used? If so, then we were wrong.

Comments:

Abstract:

- Replace "lifetimes from zero to 1000 ps are probed" to
  "lifetimes shorter than 1 ns are searched".

Prefer as is

New comment: OK


Line 214:
  Replace "Neutrinos can either be their ... or Dirac fermions" by
  "Neutrinos that are their own anti-particles are called Majorana
  neutrinos after the author of [1], unlike the known electron, muon,
  and tau neutrinos that can be called Dirac neutrinos."

prefer as is. In fact your description is incorrect. The e, mu and tau neutrinos can be Majorana as well

New comment: I see. Thank you. It was one try to replace a first sentence that did not
seem clear.


Line 218:
- Add "via an intermediate heavy neutrino N" after "modeled".

Prefer as is.

New comment: OK

- Is "(In the Letter mention of ... as well)" the official accepted
  statement? It could be better formulated.

Please suggest how? We think it is well formulated

New comment: First sentence with footnote: 
The inclusion of charge conjugate states is always implied throughout this paper.
 

Line 227:
  Add "of the magnet" after "placed downstream".

Part of standard EB detector description

New comment: It seems minimal language to me, but short was aimed for, I guess.


Line 275:
  Add "decay" in "the normalization decay mode".
 
Prefer as is

New comment: What do you mean with the normalization mode ?