This indicates that those sand dunes have already been washed away.
(This; indicates; that those sand dunes have already been washed away) Context(This indicates,List([0, 14))):(those sand dunes; have been washed; away; T:already)
This indicates,List([0, 14))
This those sand dunes
indicates have been washed
that those sand dunes have already been washed away
away T:already