Remove from all boxes on the topic "converting fractions to decimals" every sentence that addresses or explains the topic of "percentage calculation." The remaining content should remain unchanged.

Revise each box on the topic "multiplying fractions" by removing all sentences and examples that mention the terms "simplifying" or "expanding" so that only multiplication is covered.

Remove from all boxes the words "faulty" and "error." Also remove sentences that are longer than 20 words.