Rreferences for free groups

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I have done free groups. I studied it from Rotman two semesters back. But this semester I am doing combinatorial group theory and obviously it starts with free groups. I have to revise Free groups but I have never got a good intution about free groups and always have been on backfoot with them whenever have studied them. This time in one month break Ii have before semester starts I want to Free groups and all related concepts used for combinatorial group theory so that I can do well with combinatorial group theory and can get into the subject deep. Any good conceptual/elaborate references? Please suggest some books. Thanks