@prefix log: <http://www.w3.org/2000/10/swap/log#>.
@prefix owl: <http://www.w3.org/2002/07/owl#>.
@prefix : <#> .

# This gives the correct conclusions
#{ ( { :sky :color :blue }  { :grass :color :green } ) log:conjunction ?F }
#  =>  { :rest :is ?F } .


#but this does not
:g = { :sky :color :blue } .
:h = { :grass :color :green } .


{ ( :g :h ) log:conjunction ?F } => { :rest :is ?F } .