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       2   3   0   0   0
       3   0   4   0   6
       0  -1  -3   2   0
       0   0   1   0   0
       0   4   2   0   1

    use strict;
    use warnings;
...
    print('@Ai = [', join(" ", @Ai), "]\n");
    print('@Ap = [', join(" ", @Ap), "]\n");