Consecutive Free Seats

A cinema row has seats numbered from 1 where free = 1 means the seat is available. Return the seat_ids of all free seats that belong to a run of at least two consecutive free seats, ordered by seat_id.

Table schema

Cinema(seat_id INT PRIMARY KEY, free INT)

Sample data

seat_id | free
1 | 1
2 | 0
3 | 1
4 | 1
5 | 1