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my $h_orig = {
    '/a/b/c/dt/data/SUSE/tool/0.9.0' => '/a/b/c/dt/tools/SUSE/tool/0.9
+.0',
...
    '/a/b/c'                         => '/p',
    '/p/dt'                          => '/nfs/us'};

my $h_orig = { '/a' => '/b/c',
               '/b/c' => '/a',
               };