Create cursor curs_3 (art I)
insert into curs_3 (art) values ( 1 )
insert into curs_3 (art) values ( 2 )
insert into curs_3 (art) values ( 3 )

Create cursor curs_4 (art I)
index on art tag art
insert into curs_4 (art) values ( 1 )
insert into curs_4 (art) values ( 2 )

Create cursor curs_6 (art I)
index on art tag art
insert into curs_6 (art) values ( 1 )
insert into curs_6 (art) values ( 2 )
insert into curs_6 (art) values ( 2 )
insert into curs_6 (art) values ( 3 )
insert into curs_6 (art) values ( 3 )
insert into curs_6 (art) values ( 3 )

select curs_3
set relation to art into curs_4, art into curs_6
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select curs_4
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select curs_6
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select curs_3
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