Anchor: Because the nature of some military assignments makes a confirmation of the presence at duty stations difficult, if not impossible, the recording of presence for duty and of specific hours during which duty is performed each day is not required.
Entailed: We do not need to record the specific hours that duty is performed everyday.
Contradiction: It is entirely possible to record presence for duty daily.
Contradiction: I aim to retire by the time I'm 45. 
Contradiction: People are in waving flags in the street.
Contradiction: No, there aren't 
Contradiction: Boys and girls of various ages participate in a sack race.