PREFIX : <http://example/>

:x1 :left  << :a :b 123 >> .
:x1 :right << :a :b 123.0 >> .

:x2 :left  << :a :b 123 >> .
:x2 :right << :a :b 123 >> .

:x3 :left  << << :a :b 123 >> :q 999 >> .
:x3 :right << << :a :b 123.0 >> :q 999 >> .

:x4 :left  << :a :b 123 >> .
:x4 :right << :c :d 123 >> .

:x5 :left  << _:bnode1 :b 123 >> .
:x5 :right << _:bnode1 :b 123 >> .

:x6 :left  << _:bnode2 :b 123e0 >> .
:x6 :right << _:bnode2 :b 123 >> .

:x7 :left  << :a :b 9 >> .
:x7 :right << :a :b 123 >> .