This problem asks us to find all the words in a 2D array of characters. The input is a 2D array of characters, and the output is a list of strings containing all the words in the array.
A.I. Evaluation of the Solution
The candidate's solution correctly solves the problem. The candidate uses a StringBuilder to construct the words from the 2D array, which is a good approach. The candidate's code is also clean and easy to read.