Anchor: There were logistical problems to be overcome.
Entailed: They had to overcome logistical problems. 
Contradiction: They did not have to overcome logistical problems.
Contradiction: There were no issues to deal with.
Contradiction: The creatures look just as scary out in the air.
Contradiction: Some hikers carry seventy to ninety pounds.
Contradiction: Major Management Challenges and Program A Governmentwide Perspective ( GAO/OCG-99-1,January 1955).