The two rows horizontally are the same negatives, the top two are the same negatives as the bottom two. The lighter one was "cut" and than toned. The two on the right are there to try to get the same exposures so the tones of the changed one is shown accurately.
Reference, The Darkroom Cookbook, page 301, Farmer's Cutting Reducer For overexposed negatives.
The normal solution was used a total of 5 minuets. Berg Selenium Toner 1:3 was used after a wash a total of 6 minuets.
