@misc{kriebel2026_biconstrained_two_step_reachability_asymmetry,
  author = {Alec Kriebel},
  title = {Non-symmetry of biconstrained two-step reachability},
  year = {2026},
  doi = {10.5281/zenodo.23127646},
  url = {https://doi.org/10.5281/zenodo.23127646},
  note = {Unrefereed preprint, version 1.0}
}