Can use some design patterns images? :D :D

Hello,

I am preparing materials to teach angular at local university and i want to quickly tell them that angular out of the box makes its users use all best design patterns... and i want to show students one or two visualization of what design pattern is 

since you have so cool drawings... can i use them in my presentation? just 2 or 3 (observer, singleton maybe)
of course i will properly link them to your website

best!