Letter submitting contest entry without a purchase

Family Holiday At The Ocean Contest
The Best Food Company
Hometown OH

Dear Contest Manager

Please find enclosed a 3x5 index card for entry into your contest. I have written my name and address on the card as an entry form for your 'Family Holiday at the Ocean' contest. As stated in your rules, I am not obligated to make a purchase of any product to enter the contest. I have complied with all other requirements for your contest to enter.

Sincerely
Margaret Wayman