F goes to vacation on one of the months which has 30 days. The number of persons goes to vacation before F is same as after C. G does not go to vacation on 21st but goes immediately after B.
| | Case 1 | Case 2 | Case 2a |
| Month | Date | Person | Person | Person |
| March | 12 | | | |
| March | 21 | | B | |
| April | 12 | F | G | |
| April | 21 | B | F | F |
| May | 12 | G | C | C |
| May | 21 | C | | B |
| August | 12 | | | G |
| August | 21 | | | |
The number of persons goes to vacation between A and E is one more than the number of persons who go in between H and B. H and B goes to vacation on different months. D and C goes to vacation on the same date. A does not go to vacation on August. More than three person goes to vacation in between B and D.
| | Case 1 | Case 2 | Case 2a | Case 2a(1) |
| Month | Date | Person | Person | Person | Person |
| March | 12 | D | H | H | D |
| March | 21 | A | B | A | H |
| April | 12 | F | G | D | A |
| April | 21 | B | F | F | F |
| May | 12 | G | C | C | C |
| May | 21 | C | A | B | B |
| August | 12 | E | | G | G |
| August | 21 | H | E | E | E |
Case 1 is invalid because D and C goes to vacation on the same date.
Case 2 is invalid because H and B goes to vacation in different months.
Case 2a is invalid because there should be more than three person who goes to vacation in between B and D.
Thus, Case2a(1) only follows
| | Case 2a(1) |
| Month | Date | Person |
| March | 12 | D |
| March | 21 | H |
| April | 12 | A |
| April | 21 | F |
| May | 12 | C |
| May | 21 | B |
| August | 12 | G |
| August | 21 | E |
A does not belong to that group because A goes to vacation on 12th while others on 21st
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