If only one animal has its mouth open wide showing its teeth and tongue.
return animal ;return mouth of #1 ;return #1 where  #2 is open ;return teeth of #1 ;return tongue of #1 ;return #3 that is showing #4 ;return #6 that is showing #5 ;return number of  #7 ;return if  #8 is equal to  one
['select', 'project', 'comparative', 'project', 'project', 'filter', 'filter', 'aggregate', 'boolean']