3-tile set (1pt): All tiles have different speech bubble styles AND all tiles have different inner symbols.
4-tile set (3pts): All tiles have the same speech bubble style AND all tiles have different inner symbols.
5-tile set (7pts): All tiles have different speech bubble styles AND all tiles have the same inner symbol. Maximum points!
Not a set: Two tiles have the same speech bubble style while one is different. Each property must be all same or all different — not a mix.