Obvious but i've not thought about it before... Interlinked with the value rule: - All data cells can be read for any code cell - A code cell's writes on

Obvious but i've not thought about it before... Interlinked with the value rule: - All data cells can be read for any code cell - A code cell's writes only the value of its data cell https://youtu.be/U9uZlEqUQw0?t=474 https://youtu.be/U9uZlEqUQw0?t=474 (start at 7:51)