(わく) Literally, a frame. Window frame. Door frame. Figuratively, a limit to your actions. Color inside the lines. Think of a solution within these parameters. 枠の中で考えてください。
(げんかい) Limit. The sky’s the limit. Superman has unlimited power.   $$$
(せいげん) Restrictions  – like limits on trade or imports. Rules and regulations designed to restrict something without outright prohibiting it.   SITU