['Mayweather', 'struggle', 'keep', 'EmptyParameter', 'EmptyParameter'] ['Mayweather', 'keep', 'EmptyParameter', 'they', 'with']
['<PERSON>6', 'battle-36.4', 'keep-15.2', 'EmptyParameter', 'EmptyParameter'] ['<PERSON>6', 'keep-15.2', 'EmptyParameter', '<PRP>', 'with']
Mayweather struggles to keep up with them.
<PERSON>6 struggles to keep up with <PRP>.