Eight persons M, N, O, P, Q, R, S, and T are seated around a square table with four sitting at the corners facing inward and four at the middle of the sides facing outward. Each was born in a different month from January to August of the same year. Given the following clues:
- Q was born in a month with 30 days and faces the center. - The person 3rd to the right of Q is 2 months older than Q. - The number of persons older than T equals the number younger than P. - Only one person is older than N. - The person born in June is 2nd to the right of the person born in February. - S is 2nd to the left of N. - R is the youngest and neighbor of T. - P is one month older than Q and faces outside. - O is 3rd to the left of R. - The person born in January is 2nd to the left of O. - S is older than O.
Based on the above, which of the following persons does not belong to the group?

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**Solution:**

1. Q is born in a month with 30 days and faces the center, so Q's birth month is either April or June.

2. The person 3rd to the right of Q is 2 months older than Q, so this person’s birth month is either February or April.

3. Only one person is older than N, so N must be born in February.

4. S is 2nd to the left of N.

5. P is one month older than Q, so if Q is born in April, P is born in March.

6. The number of persons older than T equals the number younger than P. Since 5 persons are younger than P, T must be born in June.

7. The person born in June is 2nd to the right of the person born in February, confirming T is June and N is February.

8. R is the youngest and neighbor of T, so R is born in August.

9. O is 3rd to the left of R.

10. The person born in January is 2nd to the left of O.

11. S is older than O.

12. P faces outside.

From these clues, the final arrangement is:

- N (February)
- P (May)
- S (March)
- O (July)
- Q (June)
- T (April)
- R (August)

Since O's birth month and position contradict the logical sequence of ages and seating, O does not fit consistently in the group.

**Answer:** O

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