Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the StuffitX value that has a Stuffit of unknown, LHA/LZH of yes, and unknown ISO/CD image?

### Inputs:
table_name: table, columns: ['gzip', 'bzip2', 'LHA/LZH', 'StuffIt', 'StuffIt X', 'ISO/CD Image']

### Response:
SELECT StuffIt X FROM table WHERE StuffIt = unknown AND LHA/LZH = yes AND ISO/CD Image = unknown