text: SELECT tab3.v0 AS v0 , tab2.v3 AS v3 , tab1.v2 AS v2 
   FROM    (SELECT sub AS v0 
  	 FROM sorg__nationality$$4$$
  	 
  	 WHERE obj = 'wsdbm:Country1'
  	) tab3
   JOIN    (SELECT sub AS v0 
  	 FROM foaf__age$$1$$ 
  	 WHERE obj = 'wsdbm:AgeGroup7'
  	) tab0
   ON(tab3.v0=tab0.v0)
   JOIN    (SELECT obj AS v0 , sub AS v3 
  	 FROM mo__artist$$3$$
  	) tab2
   ON(tab0.v0=tab2.v0)
   JOIN    (SELECT sub AS v0 , obj AS v2 
  	 FROM foaf__familyName$$2$$
  	
  	) tab1
   ON(tab2.v0=tab1.v0)
  
  
  ++++++Tables Statistic
  foaf__familyName$$2$$	2	SO	foaf__familyName/mo__artist
  	VP	<foaf__familyName>	69970
  	SS	<foaf__familyName><foaf__age>	35203	0.5
  	SO	<foaf__familyName><mo__artist>	503	0.01
  	SS	<foaf__familyName><sorg__nationality>	13990	0.2
  ------
  mo__artist$$3$$	3	OS	mo__artist/sorg__nationality
  	VP	<mo__artist>	1335
  	OS	<mo__artist><foaf__age>	539	0.4
  	OS	<mo__artist><foaf__familyName>	1027	0.77
  	OS	<mo__artist><sorg__nationality>	247	0.19
  ------
  sorg__nationality$$4$$	3	SO	sorg__nationality/mo__artist
  	VP	<sorg__nationality>	19924
  	SS	<sorg__nationality><foaf__age>	9897	0.5
  	SS	<sorg__nationality><foaf__familyName>	13990	0.7
  	SO	<sorg__nationality><mo__artist>	126	0.01
  ------
  foaf__age$$1$$	2	SO	foaf__age/mo__artist
  	VP	<foaf__age>	50095
  	SS	<foaf__age><foaf__familyName>	35203	0.7
  	SO	<foaf__age><mo__artist>	337	0.01
  	SS	<foaf__age><sorg__nationality>	9897	0.2
  ------
  