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use CGI qw/:cgi/;

print STDOUT "The tax year is @{[ param('TAX_YEAR') ]}";

print STDOUT "The tax year is ", param('TAX_YEAR');

use constant DOWNPAYMENT => 'DOWNPAYMENT';

print STDOUT "Downpayment is: ", param(DOWNPAYMENT);

# Gives an error
print STDOUT "Downpayment is: ", param(DOWNPAMENT);