Sure! We'll do a harder key this time. Say you have a Db on the bottom and you need a minor 7th above it. First you count the lines and spaces to figure out what note a 7th above D is. Next, you figure out the key of Db. A 7th above D is C. The key of Db has 5 flats—B E A D G. C is natural in the key so C would be major but we need a minor 7th so we have to lower the pitch a half step. Meaning Cb would be a minor 7th above Db.