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$oWkBook    = {
    students =>[
...
        {fname=>'dill',lname=>'mill',age=>'56'},
    ],
};

### iterate (current)
for my $oWkSheet (keys %{$oWkBook}){
...
        };
    };
};

### iterate (wanted)
for my $item ($oWkBook->iterate_fields()){
    $item   =~ s/^\s+\n$//;
};