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Copyright

Permitted personal use and how to report a copyright concern.

Original text, site design, calculator presentation and graphics are protected by copyright.

Personal use

You may read, print or save pages for personal, non-commercial planning. You may link to pages using their canonical URLs.

Permission required

Do not republish substantial text, mirror the site, remove attribution, sell copies or use automated extraction to create a competing publication without written permission.

Quotations

Brief quotations may be used where permitted by law with clear attribution and a link to the source page.

Copyright concerns

Submit a specific notice through the help desk identifying the work, URL, claimed right and requested action.