When trading Nash, he gave the suns a 20 15 draft pick. This draft is protected by the first five digits of 20 15 and the first three digits of 20 16- 17, but not by 20 18. Suppose the Lakers won the top five in 20 15, and the first round of the draft was protected by the Sun in 16, and so on until the first round was not protected in 18.
Assuming that the Lakers won the top five on 20 15, the top three on 20 16 and the top three on 20 17, they only need to give the first round of non-lotto the Sun on 17 and the second round to the Magic on 18.