- Rename enum in chapter.rs - `struct EHSketchBucket` and `struct EHVolume` are highly duplicated - `struct EHUnivOptimized` may share "something" with a regular EH+UnivMon - Reorg EH related files into a subdir, and re-export - Limit new trait - avoid situation that EH, as a functionality, has many traits
struct EHSketchBucketandstruct EHVolumeare highly duplicatedstruct EHUnivOptimizedmay share "something" with a regular EH+UnivMon