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In the branch of linguistics known as pragmatics, a presupposition (or ps) is an implicit assumption about the world or background belief relating to an utterance whose truth is taken for granted in discourse. Examples of presuppositions include:
Do you want to do it again?
Presupposition: that you have done it already, at least once.
Jane no longer writes fiction.
Presupposition: that Jane once wrote fiction.
So you get the idea, as we are programming ourself all the time and we do listen to what we say, it can be very useful to use presupposition on ourselves.