`Command \st already defined` while compiling PDF statement

[wil93]

We sometimes get this note while running TMR on a task:

Statements
english.pdf           ReturnCode(12)
Warning: Found Latex errors while compiling the booklet english.pdf
   Note: Line 98: Command \st already defined.

Which I suspect is caused by the fact we are re-defining \st to mean "subtasks", when it's already defined normally to mean "strikethrough". See: