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Whats the license type for these 5 free packs?

I cant for the life of me figure out why some of the sprites in tiles.png are duplicated :(

I noticed most are shadow/no-shadow versions... bushes, rocks, wood fences, etc.  But I cant find any differences between the 6 chest sprites and the 2 stone wall sets.  All appear in the spring "column" for reference.  And why are they (the walls) not duplicated in the winter section? 

For the new(er) wall inner/outer tiles I think the set is missing a "wall front" tile with #422835 at the bottom outline.
  

 I suppose I can use this one but can't slice that in Unity :(

I love the new combined pack but curious as to why so many tiles were removed?

Much appreciated!!!   tyvm for the added details :)

I dont see the additional ground details from the example screenshots...   did the long grass, flowers not make it into the sheet?

Love what you have here!