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QGIS 3.4.7

I have a lot of Models where there are some string inputs. In all of them, I have to enter the string between quotation marks ''. I understand the meaning and pourpose of them in any coding.

What I'm looking for is a way that the user doesn´t have to type the '' to avoid mistakes.

How could I concatenate '' with the string typed in the modeler?

That´s how a string input looks in the modeler.

enter image description here

The inputs given in the String Input are used in a simple Field Calculator to fill a new column.

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