I'm not sure what's wrong with my code here... I'm sure I've just done something silly.
I would expect this code to only select things that are a = 0 AND b = 0 or 1 AND c = 0 or 1 but it's picking everything where a = 0.
Any help would be much appreciated! The code works with only one indented line (e.g., a = 0 AND b = 0 or 1) but doesn't work with both indented lines.
Capx here: http://db.tt/xJln01ew