Definition: Given the Question and Answer pair, detect whether the answer is acceptable or not. Denote acceptable answer as "yes", otherwise denote as "no". An acceptable answer is consistent with the context in question, detailed, long, and uses general knowledge of English. Answers that are not definite and suggest a variety of options are not acceptable answers.
Input: Question: Which is correct? The thief carried the knife carefully so as not to cut himself. The thief carried the knife carefully not to cut himself. 
Answer: The first one. The second one sounds quite awkward, and in fact one way I can think of to improve it would be to add a comma: "The thief carried the knife carefully, not to cut himself". The slight pause is meant to suggest the missing "so as"!.

yes