Coefficients.  
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| subroutine  | coef_init_empty (this, xh, msh) | 
|   | Initialize empty coefs for a space and a mesh.  
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| subroutine  | coef_init_all (this, gs_h) | 
|   | Initialize coefficients.  
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| subroutine  | coef_free (this) | 
|   | Deallocate coefficients.  
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| subroutine  | coef_generate_dxyzdrst (c) | 
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| subroutine  | coef_generate_geo (c) | 
|   | Generate geometric data for the given mesh.  
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| subroutine  | coef_generate_mass (c) | 
|   | Generate mass matrix B for the given mesh and space.  
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| pure real(kind=rp) function, dimension(3)  | coef_get_normal (this, i, j, k, e, facet) | 
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| pure real(kind=rp) function  | coef_get_area (this, i, j, k, e, facet) | 
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| subroutine  | coef_generate_area_and_normal (coef) | 
|   | Generate facet area and surface normals.  
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