---
title: 'Pitfall drills index'
part: 'Appendices'
partNumber: 11
order: 5
subtitle: 'D1–D6 with all Bug cells collected for review'
---

_Content coming soon._

<Run>{`// D1: Use [ ] not { } for blocks
// D2: Don't use reserved words as names
// D3: One let per name
// D4: Parenthesize negative literals: fd (-5)
// D5: home sews — use moveto 0 0 instead
// D6: Machine commands are discarded inside trace
repeat 4 [ fd 20 rt 90 ]`}</Run>

<Checkpoint chapterId="appendix-e">Appendix content coming soon.</Checkpoint>