How many years after Hernán Cortés left to explore the Mexican coast did Tenochtitlan fall to the Spanish?
return Hernán Cortés left to explore the  Mexican coast ;return Tenochtitlan did fall to the  Spanish ;return year of #1 ;return year of #2 ;return difference of #3 and  #4
['select', 'select', 'project', 'project', 'arithmetic']