Interesting comment about the L, S, and D usage and rhyming. I was particularly surprised by the effort that goes into Eminem's rap that I just contributed to "good flow". Some of that effort explained in this video: https://www.youtube.com/watch?v=ooOL4T-BAg0
Eminem has spoken about how much he enjoys playing with words. One of the techniques he's mentioned is taking two words that don't rhyme and bending the sound of each about half way towards each other.