If there is at least one sled dog team pulling people on dog sleds through the snow.
return sled dog  teams ;return people ;return dog  sleds ;return #2 on #3 ;return the  snow ;return #1 pulling #4 ;return #6 through #5 ;return number of  #7 ;return if  #8 is at least one
['select', 'select', 'select', 'filter', 'select', 'filter', 'filter', 'aggregate', 'boolean']