Statement 2 (The Dual Effect of the CTC)

In the CTC, for any $l\left(i,j\right)$ , $i,j=1,2,\cdots ,48$ and $i\ne j$ , there exists a $\widehat{j}\in \left\{1,2,\cdots ,48\right\}$

such that $l\left(i,j\right)=l\left(i,\widehat{j}\right)$ .