The correct answer to this open question is the following.
This is reading between the lines. It is taking something that you read and putting it together with something that you already know to make sense of what you read. You make an inference.
When we say we make an inference is that we are making a conclusion based on what we know or based on the evidence that is presented. For instance, if we read the telephone service contract from the new company we just read between the lines and realize that is similar to previous contracts with other companies and stop reading it because we make an inference of the content of the document.