In **sectional binary form**, the first reprise closes in the tonic key. In the diagrams below, the superscripts 1 and 2 indicate tonic and non-tonic keys, respectively. $ \text{||: A}^{1}\text{ :||: B}^{1}\text{ :||}\quad\text{or}\quad\overset{\text{A}}{\text{||: a}^{1}\text{ :||}}\kern-1.258ex\overset{\text{B}}{\text{||: b}^{2}\text{ a}^{\prime 1}\text{ :||}} $