Reload file
C+x C+v
Open file
C+x C+f
Kill buffer
C+x k
Select Buffer
C+x b
Next Buffer
C+x <right>
Prev Buffer
C+x <left>
Format Region
C+M+\
Join Line
M+^
Undo
C+x u
Run
M+Enter
Comment Block
M+;
Go Function Definition
M+.
Change Paren Style
C+c C+p
Send Region to REPL
C+c C+r
https://cgi.soic.indiana.edu/~c311/lib/exe/fetch.php?media=emacs-schemer-reference-card.pdf