How to correctly understand the description of the Flyweight pattern?

Question

Design patterns

The object of the ConcreteFlyweight class must be shared

UnsharedConcreteFlyweight (Row, Column) - Unshared Concrete Flyweight
:
- Not all subclasses of Flyweight need to be shared.
The Flyweight interface allows separation but does not enforce it.

I don't really understand what it's about.

Answer 1

UnsharedConcreteFlyweight is just an object that holds all the states. It only shows that the implementation of this pattern does not force all objects that implement the Flyweight interface to be shared.