Examples of sequence classes with unique structures. On the left, an example of a Z-structure proposed by Aichholzer et al.  is shown. On the right, we show an example of a L1-structure proposed by Gupta et al. . An L1-structure has one bend whereas the other L-structure we experiment with (L0) has no bends. The sequences associated with these structures have a provably unique optimal conformation [51, 52].