row (resp. col) extracts one or several rows (resp. columns)
of a matrix.
row (resp. col) takes 2 arguments : a matrix A, and an integer n
or an interval n1..n2.
row (resp. col) returns the row (resp. column) of index n of A,
or the sequence of rows (resp. columns) of index from n1 to n2 of A.
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Output :
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