Five partners (P₁, P₂, P₃, P₄, and P₅) jointly own an electric company. P₁ owns 22 shares of the company, P₂ owns 15 shares, P₃ and P₄ each own 8 shares, and P₅ owns 5 shares, with the usual agreement that one share equals one vote. Describe the partnership as a weighted voting system using the standard notation [9: W₁,W₂, ...,Wₙ ] under the following conditions.
(a) Decisions in the partnership are made by simple majority.
(b) Decisions in the partnership require two-thirds of the votes.

(a) The description of this voting system in standard notation is [___:__,__,__,__,___] (Use descending order.)