anchor.diff:    bool operator ==(other) =>
         identical(other, this) ||
         other is VertexNumPair && other.vNum == vNum && other.vtNum == vtNum;
  +
  +  int get hashCode => hash2(vNum, vtNum);
   }
   
   /// A triple of numbers or which [vNum] is the reference number for a geometric
  
positive.code:           other.vNum == vNum &&
            other.vtNum == vtNum &&
            other.vnNum == vnNum;
  }
  
  /// Instance of a 2D curve defined on the parameter range from [start] to [end].
  
negative.code: library obj_statements;
  
  import 'package:quiver/collection.dart';
  import 'package:quiver/core.dart';
  
  part 'src/obj_statements/v_statement.dart';
  part 'src/obj_statements/vt_statement.dart';
  