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Circular mapping of matrix columns ($A$) resp. rows ($B$) to processors.
Analogous for matrix $B$.
Processor Array $A$_{00} $A$_{01} $A$_{02} $A$_{03} $A$_{04} $A$_{05} $A$_{06} $A$_{07} $A$_{10} $A$_{11} $A$_{12} $A$_{13} $A$_{14} $A$_{15} $A$_{16} $A$_{17} $A$_{20} $A$_{21} $A$_{22} $A$_{23} $A$_{24} $A$_{25} $A$_{26} $A$_{27} $A$_{30} $A$_{31} $A$_{32} $A$_{33} $A$_{34} $A$_{35} $A$_{36} $A$_{37}