Many tree-climbing snakes have tails that enable them to hold onto branches or vines to assist 
(Many tree-climbing snakes; have; tails that enable them to hold onto branches or vines) (tails; enable; them; to hold onto branches or vines to assist) (them; to hold; onto branches or vines; to assist) Context(them to hold,List([49, 61))):(them; to hold onto branches or vines to assist; )
them to hold,List([49, 61))
Many tree-climbing snakes tails them them
have enable to hold to hold onto branches or vines to assist
tails that enable them to hold onto branches or vines
them to hold onto branches or vines to assist
onto branches or vines to assist