If you have seven swords, there's only so much you can do with them. The main thing? Probably using them to cut something.
Because having seven swords for yourself is too much, you decide to take the swords and divide them up amongst pairs of people. You cut them into pairs, and give sets (せつ) to everyone who needs them in the village.
Currently there are no similar looking kanji which exist in the WaniKani learning system