You're thinking of form 8308 (there's a copy here to see). It can be filed separately from your return, or you can print the return and the form and mail them together. The form is supported by TurboTax and can be added to your return for e-filing. If you are using the desktop program you will be able to look at the forms you have included. In the online version you won't be able to look at forms until you have finished and paid for the software - but you can check before you file.
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