I was talking about 'Gardens by the bay' which is in Singapore. I said: "There were flowers from practically all over the world. It was so colorful there wasn't a single color I didn't see."
Is it correct to say things like:
- There wasn't a single color I didn't see.
- There wasn't a single person I knew who could help me.
- There wasn't a single house that wasn't haunted.
If they are incorrect please let me know how to express this idea correctly.