If one image in the pair shows the boat's sails up, the other image shows the sails folded down.
return one image  ;return boat in  #1 ;return sails of #2 ;return if  #3 are up ;return the  other image  ;return boat in  #5 ;return sails of #6 ;return if  #7 are folded down ;return if  both  #4 and #8 are true
['select', 'project', 'project', 'boolean', 'select', 'project', 'project', 'boolean', 'boolean']