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within the limits (framework, boundaries, price, etc.)
予算の枠内で計画を組んだ。
I put together a plan within the budget.
規定の枠内での発言が求められる。
Remarks are expected to stay within the prescribed limits.
法律の枠内であれば自由に事業を展開できる。
You are free to run your business as long as it is within the bounds of the law.