#square_matrix  a matrix with the same number of rows and columns
  supertype:  #matrix  a rectangular array of elements (or entries) set out by rows and columns
  subtype:  #diagonal_matrix  #determinant  #Latin_square  #magic_square {#nonsingular_matrix #singular_matrix}
  part:  #diagonal  (mathematics) a set of entries in a square matrix running diagonally either from the upper left to lower right entry or running from the upper right to lower left entry

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