How many more million tonnes of cocoa did African nations produce than Asia and Oceania did?
return African nations ;return Asia nations ;return Oceania nations ;return million tonnes of cocoa of  #1 ;return million tonnes of cocoa of  #2 ;return million tonnes of cocoa of  #3 ;return sum of #5 and  #6 ;return the  difference of #4 and  #7
['select', 'select', 'select', 'project', 'project', 'project', 'arithmetic', 'arithmetic']