Given a text, write a compressed version of it in a single sentence.

[EX Q]: A study by the Department of Health and Human Services shows that kids are four times as likely to do it on Halloween as on any other evening.
[EX A]: Department of Health & Human Service's study shows how kids are more likely to do it on Oct31 as other days

[EX Q]: But that does not mean that such a square cannot exist.
[EX A]: Such a square can exist.

[EX Q]: Although we associate trench warfare with World War I, trenches were characteristic also of the Civil War. A scaffold was built so that a rifleman who fired a single-shot, muzzle-loading shoulder weaponcould step up and shoot over the top of the trench.
[EX A]:
Although associated with WWI, trenches were also common in the Civil War. A rifleman could step up on a scaffold and fire a single-shot muzzle-loading weapon over the top of the trench.