Answer :
The pattern that this system detects is a four-digit number that is divisible by 3.
1. The system starts by taking an input of a four-digit number.
2. It then checks if the last digit of the input number is divisible by 3.
3. If it is, the system continues to check if the sum of the remaining three digits is divisible by 3.
4. If this turns out to be true, the system will output a signal indicating that the input number is divisible by 3.
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