Cut
If you have seven swords, there's only so much you can do with them. The main thing? Probably using them to cut something.
Take these seven swords and swing them around. Cut everything in your path, including yourself. Then, think about how dumb it was to try to use seven swords at once, and then feel the pain of the cut you gave yourself. Ouch, ouch ouch.
せつ
き
None
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.
Just make sure you think about how you need to give them away in sets, and not anything else. This is the most important thing to think about in your head as you're trying to establish the mnemonic for your kanji reading memory. It's gotta be sets.