If the sled dog team on the left heads leftward, and the dog team on the right heads rightward, and each team appears to be moving.
return sled dog  teams ;return #1 that is on the  left ;return if  #2 heads leftward ;return #1 that is on the  right ;return if  #4 heads rightward ;return #1 that appears to  be moving ;return number of  #6 ;return if  #7 is equal to  two ;return if  both  #3 and #5 are true ;return if  both  #9 and #8 are true
['select', 'filter', 'boolean', 'filter', 'boolean', 'filter', 'aggregate', 'boolean', 'boolean', 'boolean']