---
# edu-tufd
title: 'Write §3: Exercise 1 — build a character-level tokeniser in Rust'
status: completed
type: task
priority: normal
created_at: 2026-03-13T22:01:50Z
updated_at: 2026-03-16T02:30:26Z
parent: edu-u2w7
---

Implement encode/decode over a fixed character vocabulary. Read a text file, build vocab, encode to integers, decode back. No external crates.