Did a smaller number of prisoners die from bad camp conditions or from attempted escapes?
return prisoners ;return #1 that did die from  bad camp conditions ;return #1 that did die from  attempted escapes ;return number of  #2 ;return number of  #3 ;return which is lowest of #4 ,  #5
['select', 'filter', 'filter', 'aggregate', 'aggregate', 'comparison']