multCh7, this function will generate all of the possible arrangements of the data by row within a matrix, except for NA values, which will remain fixed. This function is used in pSkilMack and cSkilMack to generate the Exact distribution. For a given matrix of with k1,...kn non-missing values, this will give k1!*k2!*...*kn! possible arrangements
The matrix containing the data (including NA values) which will be rearranged by row.
The computations involved get very time consuming very quickly, so be careful not to use it for too large of a matrix.
Returns an array, containing k1!*k2!*...*kn! distinct matrices of the same size as
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