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$a = {
    bla => 1,
...
    bla => 1,
    trallxa => 2,
};

$a = {
    bla  => 1,
...
    bla     => 1,
    trallxa => 2,
};

my $h_periods = {
    Mercury => { orbital => 0.24, rotation => 58.64 },
...
    Uranus => { orbital => 84.01, rotation => -0.72 },
    Neptune => { orbital => 164.8, rotation => 0.67 },
};