PREFIX : <http://example/>

# The different kinds of orderable items.
# (Not in collation order).

:item :p :x .

:item :p <<( :s :p :o )>> .

:item :p "abc" .

:item :p _:b .

##     (Lowest) no value assigned to the variable or expression in this solution.
##     Blank nodes
##     IRIs
##     RDF literals
##     RDF 1.2 embedded triple terms
