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/usr/lib/R/site-library/phylobase/nexusfiles/treeWithSpecialCharacters.nex is in r-cran-phylobase 0.8.2-1.

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#NEXUS

BEGIN TAXA;
  DIMENSIONS NTAX=6;
  TAXLABELS
    Species_1 'Species 2' 'Species  3' 'Species/4' 'Species\5' 'Species"6'
    ;
END;
 
BEGIN CHARACTERS;
  TITLE TestCharacters;
  DIMENSIONS  NCHAR=2;
	FORMAT DATATYPE = STANDARD GAP = - MISSING = ? SYMBOLS = "  0 1";
	CHARSTATELABELS
	  1 character1 / state1.1 'state 1.2', 2 character2 / state2.1 'state 2 2';
	MATRIX
	  Species_1     01
	  'Species 2'   10
	  'Species  3'   11
	  'Species/4'   00
	  'Species\5'   01
	  'Species"6'   ?1
	  ;
END;

BEGIN TREES;
  TRANSLATE
   1 Species_1,
   2 'Species 2',
   3 'Species  3',
   4 'Species/4',
   5 'Species\5',
   6 'Species"6';
   TREE tree1 = ((((1,2),3),4),5);
END;