Commands/hybrid

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HYBRID
Version: 1.1.
Menu path: to do.

HYBRID
   hybridize/complete trees.  This exchanges non-identical groups 
   pruning unshared taxa, so that resulting tree is incomplete. 
   This is meant to be used in cases where tree-fusing (which 
   exchanges only identical groups) cannot improve the tree, 
   by virtue of the trees being too different (i.e. very poorly 
   structured data), but it outperforms tree-fusing rarely. 
   X Y/Z   exchange a chunk (with no more than Z unshared taxa) between 
           trees X and Y, then complete trees and swap. 
   -X Y/Z  same, but don't complete or swap trees 
   +N      if tree N is incomplete, sequentially add missing taxa 
   *N      same, but also swap (TBR, nomulpars)

Example: Exchange groups with no more than 5 unshared taxa between trees 2 and 4.

hybrid 2 4/5;
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