Teacher:In this task, you're given the title of a story consisting of five sentences, numbered 1 through 5. Your job is to determine which two sentences need to be swapped sentences in order to make a story that makes complete sense and is befittingly titled. Indicate your answer using the numbers of the two sentences in order, such as '34' or '25'. The first digit refers to the sentence which should come first in the story.
Teacher: Now, understand the problem? Solve this instance: Title: Semi Accident. Sentence 1: He hit the truck head on. Sentence 2: He reached down to grab his phone because it was ringing. Sentence 3: When he looked up he saw a semi coming towards him. Sentence 4: Greg did not have enough time to turn his car. Sentence 5: Greg was driving home from work one day.
Student:
51