How many years had passed from when the Yunnan government reported the news to the Emperor until a Burmese army was increasing its grip of the borderlands?
return the  Yunnan government reported the   news to the    Emperor ;return a Burmese army was  increasing its grip of the  borderlands ;return year of #1 ;return year of #2 ;return difference of #4 and  #3
['select', 'select', 'project', 'project', 'arithmetic']