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$all_rows = [
  [R1C1, R1C2, ..., R1Cn],
...
  ...,
  [RnC1, RnC2, ..., RnCn],
];

# Table: group
# Columns: id, name
...
  [qw(id name group_names)],
);

$id = [
        '1',
...
                 'User',
                 'Public',
               ];