How many years passed after the death of Gustave Rolin-Jaequemyns until the death of Edward Henry Strobel?
return the  death  of Gustave Rolin-Jaequemyns ;return the  death  of Edward Henry Strobel ;return year of #1 ;return year of #2 ;return the  difference of #4 and  #3
['select', 'select', 'project', 'project', 'arithmetic']