-고는 하다 says something happens habitually or used to happen: 그런 위로의 말을 해주고는 해요 'we do tend to say comforting things like that', 필요하면 서울로 올라가서 비행기를 타고는 했는데 'when I had to, I'd go up to Seoul and fly'. Two lookalikes sit in these examples: in -(으)려고는 하다 the 는 is the topic particle adding a contrast (바로바로 보려고는 하죠 'I do at least try to check them right away'), and 참고 and 예고 in two lines are the nouns 'reference' and 'advance notice', nothing to do with this pattern.