What is the latest that activity D can start if A lasts 5 days,B lasts 7 days,C lasts 4 days,D lasts 5 days,E lasts 7 days,and F is 6 days long? 
Definitions:
Hemisphere
Half of the terrestrial globe or celestial sphere, especially one of the halves into which the earth is divided, either north-south by the equator or east-west by a meridian.
Phencyclidine (PCP)
Substance that produces euphoria, slowed reaction times, and involuntary movements at low doses; disorganized thinking, feelings of unreality, and hostility at intermediate doses; and amnesia, analgesia, respiratory problems, and changes in body temperature at high doses.
Perceptual Changes
Alterations in the way an individual interprets or experiences sensory information.
Nicotine
A stimulant drug found in tobacco products that is both highly addictive and capable of causing both psychological and physical dependency.
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