Update README.md

README.md

@@ -15,7 +15,7 @@ The state-of-the-art backbone extractor, [`CadiBack`](https://github.com/arminbi
 |    |- cnf_ft.tar.gz   # CNF formulas for fine-tuning
 |    |- bb_ft.tar.gz    # Backbone phases for fine-tuning formulas
 |
-|- dual                      # Dual CNF formulas and their backbone variable phases
+|- dual                   # Dual CNF formulas and their backbone variable phases
 |    |- d_cnf_pt.tar.gz   # Dual CNF formulas for pre-training
 |    |- d_bb_pt.tar.gz    # Backbone phases for dual pre-training formulas
 |    |- d_cnf_ft.tar.gz   # Dual CNF formulas for fine-tuning