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__Function:__**compare**`: t -> t -> int`__Function:__**compare_sort**`: t -> t -> int`- Compare the two matrices, as does respectively
`matrix_compare`

and`matrix_compare_sort`

.

__Function:__**hash**`: t -> int`__Function:__**hash_sort**`: t -> int`- Compute a hash key for the matrix, as does respectively
`matrix_hash`

and`matrix_hash_sort`

.

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