Create an analogy between the two sentences
A tree is to a forest as a book is to a___
A tree is to a forest as a book is to a library.
Complete the following task based on the instruction and optional input provided.### Instruction:
Create an analogy between the two sentences

### Input:
A tree is to a forest as a book is to a___

### Output:
A tree is to a forest as a book is to a library.