# RE9 | anthropic/claude-opus-5 | run 1

## Prompt

Schedule three 30-minute meetings between 9:00 and 12:00 in 30-min slots: Z must be at 11:00; X must occur before Y. Give a valid schedule.

## Response

**Valid schedule**

| Time | Meeting |
|---|---|
| 9:00–9:30 | X |
| 9:30–10:00 | Y |
| 11:00–11:30 | Z |

**Why it works**

- Z is fixed at its required 11:00 slot.
- X (9:00) starts before Y (9:30), satisfying the ordering constraint.
- All three meetings sit on clean 30-minute boundaries within the 9:00–12:00 window, with no overlaps.

**Alternatives**

Any pairing where X precedes Y among the free slots (9:00, 9:30, 10:00, 10:30, 11:30) also works — for example X at 9:30 and Y at 10:30, or X at 10:00 and Y at 11:30. That gives 10 possible valid combinations in total.

Would you like me to add constraints such as buffer time between meetings or attendee availability?
