more recursion tree

https://gyazo.com/6b28469b62bc265f4a7ebf8c72a7170c

https://gyazo.com/965f69c9a5e707ae29bf0c8120987988

https://gyazo.com/3fff26938483c44394990684c69e5816

https://gyazo.com/d5ae4b0c0db8e3ff778221318d933c96

https://gyazo.com/2a0a0bb7a96a5ea135c8cb0e20986ed0

https://gyazo.com/cd7e90ccbb0aa4c808517d6d8596125b

https://gyazo.com/20f5c0aa8f2ce81125e7de50c940eca4

https://gyazo.com/e37ed0f0b872ae11aa30c5f250386a68

https://gyazo.com/3a47ed1cbb49573bb48e8bb73be79a30