9 To merge elements in the **Main Menu** select **Model -> Operation -> Merge**.
18 - 2 quadrangles (quad 1 and quad 2),
19 - 4 vertices (vertex 1a, vertex 2a, vertex 1b, vertex 2b).
21 vertex 1a: vertex of the quadrangle *quad 1* to merge with the vertex *vertex 2a* of the quadrangle *quad 2*.
23 vertex 1b: vertex of the quadrangle *quad 1* to merge with the vertex *vertex 2b* of the quadrangle *quad 2*.
26 The dialogue box to merge two quadrangles is:
29 .. image:: _static/gui_merge_quads.png
42 - 2 edges (edge 1 and edge 2),
43 - 2 vertices (vertex 1 and vertex 2).
45 vertex 1: vertex of the edge *edge 1* to merge with the vertex *vertex 2* of the edge *edge 2*.
47 The dialogue box to merge two edges is:
49 .. image:: _static/gui_merge_edges.png
60 **Arguments:** 2 vertices (vertex 1 and vertex 2).
63 The dialogue box to merge two vertices is:
66 .. image:: _static/gui_merge_vertices.png
73 TUI command: :ref:`tuimergeelements`