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Simple Rules
The machine follows rules.
Let's start simple: flip every bit.
See 0 → write 1, move right
See 1 → write 0, move right
See _ → stop
That's it. "When I see X, do Y."
Every program ever written — from Instagram to Excel — is just rules like this. Lots of them.
Watch the machine flip every bit:
See 0 → write 1, move right
See 1 → write 0, move right
See _ → stop
_
1
0
1
0
_
HEAD
Sees: 1
Will write 0, move right