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<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_83k7juuqdnloubvs7o3422muha, O_RDWR) failed: No space left on device (28) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
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<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
persistable sclass NLABlock {
  S text;   // original text
  LS lines; // same, split into lines
  Set<Entity> entities; // entities
  L<Line> parsedLines;

  sclass Line {
    S text;
    int index;
    Entity introducedEntity;
    L proposition; // fragments
    
    toString {
      ret joinWithSpace(proposition)
        + (introducedEntity == null ? "" : " => " + introducedEntity);
    }
  }

  sclass Entity extends Cluster {
    S definedInLine;
    
    *(S name, S *definedInLine) { addSynonym(name); }
  }
  
  *(S *text) {}
  
  bool isParsed() { ret parsedLines != null; }
  
  toString {
    ret !isParsed() ? text : lines_rtrim(parsedLines);
  }
  
  L<Line> withoutIntros() {
    ret filter(parsedLines, line -> line.introducedEntity == null);
  }
}