R0=5, R3=10, R4=1, R5=1 (but we never set R5 – oops! we forgot to backup R3). We must add a first instruction to backup R3 into R5. But that uses a cycle.

Example: MOV R5, R0 sets R0 to R5. If it's skipped, R0 stays whatever it was – not good. But ADD R0, R0 twice in a row – if one is skipped, the other still doubles.

Better: Use R5 as a permanent target copy. Initially R5=1 (bad). So first, copy R3 to R5:

Revised script (still 12 cycles):

Final battle-tested solution for all seeds:

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Rla Walkthrough | Tod

R0=5, R3=10, R4=1, R5=1 (but we never set R5 – oops! we forgot to backup R3). We must add a first instruction to backup R3 into R5. But that uses a cycle.

Example: MOV R5, R0 sets R0 to R5. If it's skipped, R0 stays whatever it was – not good. But ADD R0, R0 twice in a row – if one is skipped, the other still doubles. tod rla walkthrough

Better: Use R5 as a permanent target copy. Initially R5=1 (bad). So first, copy R3 to R5: R0=5, R3=10, R4=1, R5=1 (but we never set R5 – oops

Revised script (still 12 cycles):

Final battle-tested solution for all seeds: tod rla walkthrough