ONE ON ONE,ONE TO ONE ONE BY ONE

1. https://dictionary.cambridge.org/dictionary/english/one-on-one
2. https://www.thefreedictionary.com/one-on-one
3. https://en.wikipedia.org/wiki/One-to-one
4. https://www.thefreedictionary.com/one-to-one
5. https://www.collinsdictionary.com/dictionary/english/one-by-one
6. http://streema.com/tv/