Step 1: Analyze each option.
- (A) Reconstruction of the proto language is a central part of the comparative method. Linguists reconstruct the features of the proto-language by comparing descendant languages.
- (B) Assembling a list of cognates is essential in the comparative method. Cognates are words in different languages that have a common origin, and they help establish relationships between languages.
- (C) Strictly using basic vocabulary lists is not the most reliable method by itself. While basic vocabulary can be used, the focus is more on systematic sound correspondences rather than just vocabulary.
- (D) Setting up sound correspondences is crucial for the comparative method. By comparing systematic sound changes across languages, linguists can establish relationships and reconstruct the proto-language.
\[
\boxed{\text{Correct answers: (A), (B), and (D).}}
\]
Examine the given data. The value of X is ________ (in integer). 
Eight students (P, Q, R, S, T, U, V, and W) are playing musical chairs. The figure indicates their order of position at the start of the game. They play the game by moving forward in a circle in the clockwise direction.
After the 1st round, the 4th student behind P leaves the game.
After the 2nd round, the 5th student behind Q leaves the game.
After the 3rd round, the 3rd student behind V leaves the game.
After the 4th round, the 4th student behind U leaves the game.
Who all are left in the game after the 4th round?
