Basic and degenerate pregeometries

@article{Giudici2012BasicAD,
  title={Basic and degenerate pregeometries},
  author={Michael Giudici and Caiheng Li and Geoffrey Pearce and Cheryl E. Praeger},
  journal={Eur. J. Comb.},
  year={2012},
  volume={33},
  pages={1178-1189}
}
We study pairs (@C,G), where @C is a 'Buekenhout-Tits' pregeometry with all rank 2 truncations connected, and G= 
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