Anchor: Among users'  the small, immobile keyboards are sometimes difficult to use, and the touch screens have to be tapped in just the right way.
Entailed: The small keyboards are not convenient to use.
Contradiction: The small, immobile keyboards are perfectly made.
Contradiction: Two women are playing tennis
Contradiction: People are indoors.
Contradiction: A boy walks around a tree.
Contradiction: Tommy said that you were correct.