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So I'm looking to purchase this manga maybe a set at a time.

But I keep on finding various sets

like the Chronicals of the Heroic Knight
The Grey Witch
The Lady of Pharis
Deedlit's Tales
And some Return to Lodoss island thing...

There's probally more but what's the exact order of this manga? Is there any other things I've missed?

I don't want to really start in the middle and have nothing make sense...