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: Another Source of Payment. Sentence 1: Jeff grabbed a couple of items from the supermarket. Sentence 2: He went to the cashier. Sentence 3: He realized that he forgot his wallet. Sentence 4: She scanned the items and told him how much he owed. Sentence 5: He took off his watch and offered to trade it for the groceries.
Student:
43