Hi Kirky.
24 has a clash in the middle letter. Clash is DT, definition is ruff.
31 Definition is soyle. Means same as ravin.
The other clash is at the end of 33, LD
the boundary is in the middle inside your clashes 5,7....then correct the clashes + use other letters outside your boundary 7,9........I'm not a scientist but its easily googlable
I found the CD ROM version of Chambers (2005) very useful for confirming both elements, the boundary and the other. All I did was enter the two words of the theme into a full text search and it came up with various entries, including the two necessary ones.