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K. K. Compute, Apply operator A K HDG for connecting local and global degrees of freedom 10: Assemble the corresponding section in the global matrix K 11: end for Algorithm 2 Construction of the right-hand side. 1: Localization of the point source S 2: for K = 1 to N b tri do 3: Construct local matrices S K 4: Compute B K S K 5: Apply operator A K HDG for connecting local and global degrees of freedom 6: Assemble the corresponding section into the global right-hand side S 7: end for Algorithm 3 Linear system solution for the hybrid variable unknowns. 1: Solve the linear system K? = S using MUMPS 2: Compute the local solutions W K 1: for K = 1 to N b tri do 2: Apply operator A K HDG for connecting local and global degrees of freedom 3