https://www.youtube.com/watch?v=uNbEfk9VNkI&list=PLwrAuUr7uhNoBoxMalScVSmpxiOWm66Gj.       probability

https://www.youtube.com/watch?v=6Me9jBm5XNY&list=PLEBRPBUkZ4maAlTZw3eZFwfwIGXaln0in.

https://www.youtube.com/watch?v=qhkZRa5wKmk&list=PLPn4eVPZKtrJXMoujdxAHLW2ZMMSXG9CV

  algorisms

https://www.youtube.com/watch?v=sYXxBU0qX9Y&list=PLPn4eVPZKtrJnqFS6E5rEF3454aEqI6CD. OR

https://www.youtube.com/watch?v=O0s45P3Ix9g&list=PLMm8EjqH1EFW9Faldu6D6Uh2j1EWWaTYe. logic

https://www.youtube.com/watch?v=Do6l420WF4E&list=PLPn4eVPZKtrI-AIET96mSMcPsKOevYnqm. database

https://www.youtube.com/watch?v=58N2N7zJGrQ&list=PLBlnK6fEyqRgp46KUv4ZY69yXmpwKOIev.

https://www.youtube.com/watch?v=pvdjg4dwtQw&list=PLrCBCI_Do84iJ-kiE1F2trKik2Ts4XelM

formal