New level-2 switching methods are developed and all irreducible ones with a single nontrivial indecomposable block are classified up to size 12.
Some computational results on the spectra of graphs
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Switching methods of level 2 for the construction of cospectral graphs
New level-2 switching methods are developed and all irreducible ones with a single nontrivial indecomposable block are classified up to size 12.