incomplete Latin-square

例句：

1. 1. The problem with the incomplete Latin-square is that it's not easy to solve.
   这个拉丁方阵不完整的问题就是它不容易解决。
2. 2. The incomplete grid was a challenge for the team to complete.
   这个不完整的网格是团队完成的一个挑战。
3. 3. The incomplete square was a puzzle that needed to be solved.
   这个不完整的方阵是一个需要解决的问题。