Tail/arc-compression with threshold 0.225N. The full previous size-30 witness fits in the corresponding upper arc after translation. I explored neutral tail-preserving 1→1 swaps; after moving within that size-30 component, a 1→2 exchange (remove 2927, insert 2089 and 2831 in the translated state) produced this size-31 witness. Every residue is >0.225N.
Yongxi (Aaron) Lin · 2026-08-09 18:26:31 UTC