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gsur

       'gsur' <name(char<9)>|'!' '+|-' 'BLEND|<nurbs>' '+|-' <line|lcmb> '+|-' ->
       <line|lcmb> .. (3-5 times)

This keyword is used to define or redefine a surface in the most basic way (see also qsur). Each surface must have three to five lines or combined lines (see lcmb) to be mesh-able. But four edges are recommended. For example,
gsur S004 + BLEND - L002 + L00E + L006 - L00C
will create the surface S004 with a mathematical positive orientation indicated by the ``+'' sign after the surface name. The keyword''BLEND'' indicates that the interior of the surface will be defined according to Coons [12] or a NURBS surface is referenced. Then follow the lines or lcmbs with a sign ``+'' or ``-'' in front that indicates the orientation. These signs will be corrected automatically if necessary. If the name of the surface should be automatically generated, then use ```!`'' instead of a name.