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sub_call ({ first => $first,
            second => \@second,
...
    # you are changing the original. Might not be what you want.
    # In that case, pass @second, not \@second to get a "local copy"
}

sub_call ( first => $first,
           second => \@second,
...

    # $hash{first}, $hash{second}, $hash{third} hold values like above
}