Chapter 53: Subsets 

You are given a grid and a list of sets. Your objective is to place every set into the grid exactly once; some sets may already be given.

Relations between neighboring cells are shown using horseshoe symbols:

• ⊃ points from a superset toward a subset. The set at the open end must contain every letter in the set at the rounded end.
• Every possible subset relation is shown. So if no symbol appears between two neighboring cells, then each set must contain at least one letter that the other does not.

Original puzzle page: inabapuzzle.com/honkaku/subset.html

53.1 Subsets controls

Within each set, every letter has a fixed position. Left-click a cell to place the letter in that position.

Right-click a cell to rule that letter out for that position.

With the keyboard, use the arrow keys to move the cursor. Press Enter to place a letter and Space to rule it out.