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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.intercom.com/intercom-link?company=PLNAR&solution=customer-support&utm_campaign=intercom-link&utm_content=We+run+on+Intercom&utm_medium=help-center&utm_referrer=http%3A%2F%2Fhelp.plnar.co%2Fen%2Farticles%2F1461703-how-do-i-measure-a-rectangular-window-using-plnar&utm_source=desktop-web>