How many months after Sawlon II sent Sithu Kyawhtin with an army did Hkonmaing die?
return Sawlon II sent Sithu Kyawhtin with an army ;return Hkonmaing did die ;return when  was  #1 ;return when  was  #2 ;return difference of #4 and  #3 in  months
['select', 'select', 'project', 'project', 'arithmetic']