What are the ids of stations that have latitude above 37.4 and never had bike availability below 7?
return stations ;return latitude of #1 ;return #1 where #2 is higher than 37.4 ;return bike availabilities of #3 ;return the  lowest of #4 for each #3 ;return #3 where #5 is at least 7 ;return ids of #6
['select', 'project', 'comparative', 'project', 'group', 'comparative', 'project']