Some floorings have inner-corner-tiles, that look different to fully surrounded tiles.
these are surely the first 6 and last 3 floor-styles in each of the left and right half of this graphic (seems likr right half is winter and left haklf is other seasons).
There should be such tiles:
-tiles with 1, 2 (neighboring and diagonal), 3 and 4 inner-corners
-tiles with a straight border-edge and 1 or 2 inner corners
-tiles with an outer corner and an inner corner
Such a tileset is completed out of 47 different tiles.

For the remaining 4 styles all different sprites maybe found, because some are shared through different tiling situations.
but i´m not fully sure