Display screen or portion thereof with a graphical user interface

The sole FIGURE is a front view of a display screen or portion thereof with a graphical user interface showing our new design.

The broken line showing of a display screen or portion thereof form no part of the claimed design.

The ornamental design for a display screen or portion thereof with a graphical user interface, as shown and described.

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Entry
David Goldman, “5 Best App to find cheap gas” Dec. 29, 2014 https://money.cnn.com/2014/12/29/technology/mobile/gas-price-apps/index.html.

	Number	Date	Country
Parent	29599269	Mar 2017	US
Child	29681719		US