It's a door / window.
It's a window.
It's a window / door.
It's a door.
It's a chair / table.
It's a chair.
It's a table / window.
It's a table.
It's a pencil / chair.
It's a pencil.
It's a bag/ book.
It's a bag.
It's a bag / book.
It's a book.