Ending of Season 4 Question

So during Season 4 of lost the writers strike happened. We ended up losing like 3-4 episodes. My question is what were those missing episodes supposed to be about? I'm pretty sure every season 4 episode of lost had a flashback or flashforward so which character would they had been about? I know theyre making up the hours with seasons 5 and 6, but im 9% sure sure the extra episodes are different from the missing episodes. Was the season 4 ending supposed to be moving the island and locke in the coffin? Or did they have a bigger reveal of something they decided to leave out?

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