How many years did the peace of Vordingborg 1435 last until Eric was dethroned in 1439?
return the  peace of Vordingborg ;return Eric was  dethroned ;return years of #1 ;return year of #2 ;return the  lowest of #3 ;return the  difference of #4 and  #5
['select', 'select', 'project', 'project', 'aggregate', 'arithmetic']