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 # Warning regarding MATLAB version
 
 MATLAB R2021a or later is required to run the code with full capabilities.
 
-For an older version, the code still runs but the stresses and strains cannot be computed. In this case proceed as follows:
+For an older version, the code still runs but the stresses and strains cannot be computed. In such a case, please adapt the code as follows:
 
   1) In the main file “internodesx”, (with x=1,2,3,…) in the function call to “setNumericalParameters(Mesh, Data, PostProcessing,…” remove the last argument-value pair “‘quantity’, {‘stress’, ‘strain’}”
   2) In the main file “internodesx”, in the function call to “plotSolution(Mesh, Data, Solution,…” remove the last argument-value pair “‘stress’, ‘sigma_yy’”
 
 # List of folders
 
 - INTERNODES_small: Code for small size problems. Explicit assemblage of the INTERNODES matrix and solution to the linear systems using backslash (direct method).
 
 - INTERNODES_medium: Code for medium to large 2D applications. The linear systems are solved using right preconditioned GMRES. The algorithm relies on a single complete Cholesky factorization.
 
 - INTERNODES_large: Code for very large 2D and potentially 3D applications. The algorithm implements inexact solves with the preconditioning matrix based on an incomplete Cholesky factorization coupled with inner iterations. **Beware: the incomplete factorization might fail !**
 
 - Westergaard: Folder used to run the experiments for the Westergaard problem.
 
 # List of main files:
 
 - internodes1: Classical Hertzian contact problem with Dirichlet boundary conditions applied to both bodies.
 - internodes2: Classical Hertzian contact problem with Dirichlet boundary conditions applied to the lower body and Neumann boundary conditions applied to the upper body.
 - internodes3: Contact problem between two rectangular blocks with Dirichlet boundary conditions applied to both bodies.
 - internodes4: Elastic contact between a sphere and a half space. Dirichlet boundary conditions are applied to both bodies.
 - internodes5: Structure with asperities and multiple contact points. Dirichlet boundary conditions are applied to the lower body and Neumann boundary conditions are applied to the upper body.
 - conforming1: Rectangular blocks with conforming meshes. Dirichlet boundary conditions are applied to both bodies.
 - conforming2: Rectangular blocks with conforming meshes. Dirichlet boundary conditions are applied to the lower body and Neumann boundary conditions are applied to the upper body.
 - westergaard: Comparison of INTERNODES with the Westergaard solution.
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