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Select or download this
```
my @tmp = ( \@arr1, \@arr2, \@arr3 );
```

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my @all;
foreach my $x (0 .. $#tmp){
...
# or do:
my @all = ( \@arr1, \@arr2, \@arr3 );
and then in-place swap (i,j) with (j,i) ..  but this will modify the o
+riginal @arrX arrays.