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May 13, 2020 at 21:45 comment added Geoff Robinson @AlexM.: The OP changed the question. It was not originally about the integral case.
May 13, 2020 at 9:07 comment added Alex M. I hope that you aren't missing the fact that the OP is working over $\mathbb Z$.
May 10, 2020 at 22:16 comment added user157838 What about the Libschitz or Hurwitz groups?
May 10, 2020 at 19:18 history answered Vít Tuček CC BY-SA 4.0