What we should do is have a standard file and or a standard var for the file - for example the file would be called "f" or be stored in the variable "$f".
The file would be a file with more then one line, with actual non-whitespace stuff on the top line of more then one character.
I think also Reversable Functions should have to be seperated by at least one instruction for example:
htmlencode($s); $htmldecode($s);
would be banned where:
htmlencode($s); rtrim($s); $htmldecode($s);
would be allowed.
Personally I'm still trying to recurse from the bottom of the file in scheme. Shame my scheme isnt very good...