First , the most important thing a person needs to survive is water .
(the most important thing a person needs to survive; is; water; T:First) (a person; needs; to survive) Context(a person needs,List([33, 47))):(the most important thing; to survive; a person)
a person needs,List([33, 47))
the most important thing a person needs to survive a person the most important thing
is needs to survive
water T:First
to survive
a person