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    $mech->submit_form(
        form_name => 'HashForm1',
...
        },
        button => "submit",
    );

$mech->form_name('HashForm1');
$mech->field("login_username",'username');
$mech->field("login_password",'password');
$mech->field("prefLanguage",00000000);
$mech->submit_form();