https://web.eecs.umich.edu/~cscott/past_courses/eecs598w14/notes/09_bounded_difference.pdf https://stats.stackexchange.com/questions/21362/understanding-proof-of-mcdiarmids-inequality https://www.stat.cmu.edu/~larry/=stat705/Lecture2.pdf https://ocw.mit.edu/courses/18-s997-high-dimensional-statistics-spring-2015/a69e2f53bb2eeb9464520f3027fc61e6_MIT18_S997S15_Chapter1.pdf https://math.stackexchange.com/questions/41536/intuitive-explanation-of-the-tower-property-of-conditional-expectation