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.

Title: Picking Switches. Sentence 1: Their mother told them to go outside and pick a switch. Sentence 2: They were playing and had broken a very expensive vase. Sentence 3: Julie and Dean were small children. Sentence 4: They grimaced and went to find a small stick. Sentence 5: Their mother used the sticks to discipline them for breaking the vase.
31