@prefix : <http://example/> .
@prefix n: <http://example/x#> .
@prefix rdf:        <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs:	    <http://www.w3.org/2000/01/rdf-schema#> .

:x1 a :A .
:x2 a :A .
:y a :B .

:A rdfs:subClassOf :B .
:B rdfs:subClassOf :C .

:A rdfs:subClassOf :Z .
#:A rdfs:subClassOf :A .

:x n:p :a1 .
:x n:p :a2 .

:x n:a :b1 .
:b1 n:b :c1 .
:c1 n:c :d1 .
:c1 n:c :d2 .

:x n:a :b2 .

:z1 n:p :z2 .
:z2 n:p :z3 .
:z3 n:p :z4 .

:z4 n:p :z1 .