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This system is based on observing the repetition of a single dozen over multiple consecutive spins. When one dozen (for example, the second dozen) appears three times in a row, it is considered "hot." From that point on, bets are placed on the other two dozens, which are now considered "cold."
The logic behind this system is that a dozen is unlikely to keep repeating indefinitely, so it’s more probable that one of the other two dozens will appear soon.
This system uses a flat betting progression: the same amount is bet in each spin.
For example, if you bet 1 chip on each of the two dozens (2 chips total per spin), you maintain that value throughout all 6 spins.