How many months passsed between Cox outlining his plan to Governor Macquarie and Macquarie's report to Bathurst?
return Cox outlining his plan to Governor Macquarie ;return Macquarie 's report to Bathurst ;return when  was  #1 ;return when  was  #2 ;return difference of #3 and  #4 in  months
['select', 'select', 'project', 'project', 'arithmetic']