Anchor: There are some efficiencies that result when multiple systems are installed at one site.
Entailed: Multiple systems on a site make things more efficient.
Contradiction: Multiple systems make things less efficient.
Contradiction: A group of young girls are viewing pets through the window of a pet shop.
Contradiction: Slim was surprised at what happened.
Contradiction: I have one son. 
Contradiction: A man and woman talk while carrying a child.