Input:

The Combat Box was a tactical formation used by heavy (strategic) bombers of the U.S. Army Air Forces during World War II. The combat box was also referred to as a "staggered formation". Its defensive purpose was in massing the firepower of the bombers' guns, while offensively it concentrated the release of bombs on a target.

Sentence: The Combat Box wasn't originally planned to be a staggered formation.

Output: It's impossible to say

Input:

Alice Sue Claeys (born February 24, 1975) is a former competitive figure skater. Representing Belgium, she won silver at the 1992 Skate Canada International and finished in the top ten at three ISU Championships the 1992 World Junior Championships (4th), the 1992 World Championships (7th), and the 1993 European Championships (8th).

Sentence: Alice Sue Claeys retired from competition in 2001.

Output: It's impossible to say

Input:

Oasis was a literary anthology published in Cairo during World War II. It was edited by Denis Saunders, David Burk, and Victor Selwyn. The introduction was written by General Henry Maitland Wilson, who was at this time Commander-in-Chief of the Middle East.

Sentence: Oasis was a literary anthology published in Cairo during World War II. Edited by Denis Saunders, David Burk, and Victor Selwyn, the introduction was written by General Henry Maitland Wilson. They were good friends.

Output: It's impossible to say

Input:

Pearse Island is an island in western British Columbia, Canada, in the Portland Inlet, an inlet of the Pacific Ocean. The island was first charted in 1793 by George Vancouver during his 1791-95 expedition. It was named by George Henry Richards, captain of "HMS Plumper", circa 1860, in honour of William Alfred Rombulow Pearse of the Royal Navy, who had been commander of "HMS Alert".

Sentence: The island is prone to bad weather

Output:
It's impossible to say