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...  ...  @@ 949,6 +949,7 @@ List of expressions are also widely used, and are defined as: 
Point @{ @var{expression} @}   
<Physical> PointLineSurfaceVolume "*"   
PointLineSurfaceVolume In BoundingBox @{ @var{expressionlist} @}   
BoundingBox PointLineSurfaceVolume @{ @var{expression} @}   
Physical PointLineSurfaceVolume @{ @var{expressionlist} @}  
@c @var{duplicata}  already implemented: should we explain this?  
@end example  
...  ...  @@ 969,11 +970,12 @@ permit to reference an expression sublist (whose elements are those 
corresponding to the indices provided by the @var{expressionlist}).  
The next two cases permit to retrieve the indices of entities created  
through geometrical transformations and extrusions (see  
@ref{Transformations}, and @ref{Extrusions}). The last three cases  
permit to retrieve the coordinates of a given geometry point  
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(@pxref{Points}), to retrieve the id numbers of all points, lines,  
surfaces or volumes in the model, or to retrieve the elementary entities  
making up physical groups.  
@ref{Transformations}, and @ref{Extrusions}). The next two cases allow  
to retrieve antities in a given bounding box, or get the bounding box of  
a given entity. The last three cases permit to retrieve the coordinates  
of a given geometry point (@pxref{Points}), to retrieve the id numbers  
of all points, lines, surfaces or volumes in the model, or to retrieve  
the elementary entities making up physical groups.  
To see the practical use of such expressions, have a look at the first  
couple of examples in @ref{Tutorial}. Note that, in order to lighten the  
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