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//! Flow: the underlying trait of flow.er.
//!
//! Let's start with some key concepts.
//!
//! # A. Arena
//!
//! An arena is a typical data structure which has:
//! 1. A map / vec to store the data.
//! 2. A relationship graph which only tracks after the keys / indices.
//!
//! FlowArena implements an arena-like data structure, but it has integrated the data map and the relationship graph, since both of them require an Id to visit.
//!
//! # B. Flow
//!
//! trait Flow requires all the sub-traits of Flow.
//!
//! // Todo: Finish Flow docs.
//!
pub use ;