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I didn't realize the app he built is really well made.
He said the app he built is really well made.
She mentioned the app he built is really well made.
Don't you think the app he built is really well made?
It turns out the app he built is really well made.
I suppose the app he built is really well made.
Apparently, the app he built is really well made.
I'm pretty sure the app he built is really well made.
Rumor has it the app he built is really well made.
I heard the app he built is really well made.
There's no doubt the app he built is really well made.
It seems the app he built is really well made.