Agreed, it’s also evident that early DCT is permeable to sodium but not water in below image from Miledown review sheets. The closest note that mentions the same for the early DCT is 1559360975001, saying that it’s a site of salt reabsorption - although it doesn’t specify the lack of permeability to water. For this reason, it’d be optimal to include both parts in c1 - chunking them together makes memorizing the overall scheme easier
