If there are at least two sets of sled dogs pulling a bundled up human behind them.
return sled dogs ;return sets of #1 ;return human ;return #3 that is bundled up ;return #2 that are pulling #4 behind them ;return number of  #5 ;return if  #6 is at least two
['select', 'project', 'select', 'filter', 'filter', 'aggregate', 'boolean']