Duff, rotten or growing

[Suzy B]

Here are some of my eggs I have candled can you help me work out what's going on all are within week or so of hatch.
There are two eggs top and bottom and one I am certain is a duff xx

 

[Chicken Chat]

The first two pics are kind of dark and a little hard to see on my screen but it looks like they are fairly full so I would say those are developing. The third I will venture a guess is also developing. The second to last looks like a quitter. The last one is infertile, get that one out of there. Good luck with your babies!