I have been reading alot about leaders/tippets but I'm still a little fuzzy understanding leaders/tippets formulas and the purpose behind them. Can someone explain the formula below and so I understand it. I know it ends up as a 3X tippets but why all the different sizes in the middle? (26" of 07X) 22" of 05X (17" of 03X) 7"of 02X (7" of 0X) 7" of 2X (22" of 3X)