['Species', 'trade', 'fleet', 'item', 'for']
["Synset('category.n.02')", 'exchange-13.6.1', "Synset('line.n.23')", "Synset('signal.n.01')", 'for']
Species would trade an entire fleet of starships for the item.
Synset('category.n.02') would trade an entire Synset('line.n.23') of Synset('craft.n.02') for the Synset('signal.n.01').