一律 (uniformly / without exception)

Every item, same rule

• same一律yī lǜ + Predicate = "all / uniformly / without exception".
• commodity商品shāng pǐnsame一律yī lǜto beat打dǎ八折bā zhé = "all goods are 20% off, no exceptions."
• same一律yī lǜ applies one rule to everyone / everything.

(Subject) + same一律yī lǜ + Predicate

• same一律yī lǜ enforces a single rule across the board.

goods商品shāng pǐnuniformly一律yí lǜ20% off打八折dǎ bā zhé。

• commodity商品shāng pǐnsame一律yī lǜto beat打dǎ八折bā zhé = "all goods are 20% off."

Recap

Read the full reference: HSK 6 grammar — Adverbs.