premise: An industrial electrician attaches exactly seven components designated S, T, V, W, X, Y, and Z to a circuit board in exactly seven consecutive steps; exactly one component is attached per step. Each component is attached exactly once, and each is attached either by hand or by machine, but not both. X is the fourth component attached. Exactly two components are attached by hand at some time before X is attached. No component is attached by hand before T is attached. W is attached at some time before T. Y is attached at some time after both Z and S. The sixth component attached is attached by hand. Which one of the following could be an accurate list, in order, of the first three components attached?
hypothesis: Y, W, T