Display Screen or Portion Thereof with a Graphical User Interface

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FIG. 1 is a front view of a first embodiment of a display screen or portion thereof with a graphical user interface;

FIG. 2 is a front view of a second embodiment of a display screen or portion thereof with a graphical user interface;

FIG. 3 is a front view of a third embodiment of a display screen or portion thereof with a graphical user interface;

FIG. 4 is a front view of a fourth embodiment of a display screen or portion thereof with a graphical user interface;

FIG. 5 is a front view of a fifth embodiment of a display screen or portion thereof with a graphical user interface;

FIG. 6 is a front view of a sixth embodiment of a display screen or portion thereof with a graphical user interface;

FIG. 7 is a front view of a seventh embodiment of a display screen or portion thereof with a graphical user interface;

FIG. 8 is a front view of an eighth embodiment of a display screen or portion thereof with a graphical user interface;

FIG. 9 is a front view of a ninth embodiment of a display screen or portion thereof with a graphical user interface;

FIG. 10 is a front view of a tenth embodiment of a display screen or portion thereof with a graphical user interface;

FIG. 11 is a front view of an eleventh embodiment of a display screen or portion thereof with a graphical user interface;

FIG. 12 is a front view of a twelfth embodiment of a display screen or portion thereof with a graphical user interface;

FIG. 13 is a front view of a thirteenth embodiment of a display screen or portion thereof with a graphical user interface;

FIG. 14 is a front view of a fourteenth embodiment of a display screen or portion thereof with a graphical user interface;

FIG. 15 is a front view of a fifteenth embodiment of a display screen or portion thereof with a graphical user interface;

FIG. 16 is a front view of a sixteenth embodiment of a display screen or portion thereof with a graphical user interface; and,

FIG. 17 is a front view of a seventeenth embodiment of a display screen or portion thereof with a graphical user interface.

The dot-dashed broken lines depict the display screen or portion thereof and form no part of the claimed design.