In which ξ i k could be the gray relational coefficient of xi to x0 in k times, and represents the relative big difference of the comparative sequence xi and reference sequence xo in ‘k’ times for any parameter i. There is absolutely no definitive remedy to this problem, as https://dean5hrzi.dailyblogzz.com/31622329/new-step-by-step-map-for-how-to-clean-sewage-in-qassim