Oh man, so many sets of words. I don't think I'll ever beat this level!

You'll need this too:

425 307 1085 644 1217 316 551 274 1528 1288 57 257 1787 120 937 1264 603 2332

13

Hint #1: I wonder why the word sets is bolded?

Hint #2: If you really, think about it, words are kind of like sets of letters...

Hint #3: The arrow in the UK points to Brixton