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New order 57 best matrices

The following are three inequivalent sets of best matrices of order 57 found by MathCheck and are currently the largest known best matrices.  Prior to our work, the largest known best matrices were of order 43.  The coloured squares represent one and the grey squares represent negative one and each best matrix is colored using a different colour.  The defining rows of these matrices are also available to download in text format.

Best matrices of order 57