Anchor: An electronic signature is a data authentication process, which when effectively implemented, provides assurance that data associated with the signature has not been altered or changed.
Entailed:  An electronic signature is a data authentication process
Contradiction:  An electronic signature is not a data authentication process
Contradiction: The new characters were very different from the old.
Contradiction: I haven't quit drinking.
Contradiction: The specificity was wholly adequate.
Contradiction: a man has a bottle