For example, "empty chair and empy table" is actually the same as the Bishop's aria at the beginning; "on my own" is the same as Fantine's aria before her death, etc. In fact, many of this musicals are written in a thematic way, so in fact many of them are the same. But the composer has cleverly used this technique to avoid being discovered by everyone. I think it would be interesting to sort it out, and it would be more helpful to discover the internal logic.