['sign', 'be', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
["Synset('location.n.01')", 'representation-110.1', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
There are signs of at least two habitable planets.
there are Synset('location.n.01') of at Synset('least.a.01') <NUMBER>3 habitable Synset('natural_object.n.01').