List from which date and to which date these staff work: project staff of the project which hires the most staffs
return projects ;return staffs of #1 ;return number of  #2 for each #1 ;return #1 where #3 is the  highest ;return staffs of #4 ;return work dates of #5 ;return the  lowest of #6 ;return the  highest of #6 ;return #7 ,  #8
['select', 'project', 'group', 'comparative', 'project', 'project', 'aggregate', 'aggregate', 'union']