source: You may add a passage of up to five words as a Front-Cover Text and a passage of up to 25 words as a Back-Cover Text to the end of the list of Cover Texts
target: You can add 5 words or less as a front cover text and 25 or less as a back cover text to the end of the list of cover texts in the modified version.
references: You can add 5 words or less as a front cover text and 25 or less as a back cover text to the end of the list of cover texts in the modified version. for the cover texts in the modified version you have to add a passage of five words as a front-cover text and apassage upto 25 words as back-cover text You may add a sentence of up to five words printed on the front of the book, and sentences of up to 25 words printed on the back of the book, to the end of the list of cover wording choices in the version that allows changes. You may add a passage of up to five words as a Front-Cover Text, and a passage of up to 25 words as a Back-Cover Text, to the end of the list of Cover Texts in the altered Version. a passage of up to five words as a Front-Cover Text, passage of up to 25 words as a Back-Cover Text, in the Modified Version. You can add a verse of up to five words as a Front-Cover Text, and a paragraph of up to 25 words as a Back-Cover Text, to the end of the list of Cover Texts in the amended version. To the end of the list of Cover Texts in the Modified Version, you may add a passage of up to five words as a Front-Cover Text and a passage of up to 25 words as a Back-Cover Text