vote for book cover

It is a long time since I decided to design this ebook cover. After some discussion with @niangaotuantuan , ~~I designed 4 different cover pictures for this useful algorithm notes.~~ @kokdemo contributed his new design(No.1). Which one do you like best? I prefer the second one. :)
## No.1 - Cover without characters

## No.2 - Cover with transparent binary bits

## No.3 - handwritten fonts with black

Serious and Powerful.

## No.4 - handwritten fonts with blue

Graceful and vivid.

## No.5 - artbrush fonts with black

Heavy.

## No.6 - artbrush fonts with blue