Detailed Instructions: 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.
Q: Title: Learning to Read. Sentence 1: They went to the library so Jane could pick out a book. Sentence 2: Jane wanted to teach her young daughter how to read. Sentence 3: She chose a picture book that would be easy to understand. Sentence 4: When Jane read the word, she pointed to the picture in the book. Sentence 5: Jane read to her daughter every day until she could read it herself.
A:
21