is the object at the very front made of the same material as the object in the very back?
return objects ;return #1 at the   very  front ;return #1 in the   very  back ;return the   material that  #2 is  made of ;return the   material that  #3 is  made of ;return if  #4 and #5 are the   same
['select', 'filter', 'filter', 'project', 'project', 'boolean']