Parsed test spec with 4 sessions

starting permutation: s1r s3r s2r1 s4r1 s1c s2r2 s3c s4r2 s4c s2c
step s1r: SELECT * FROM foo;
 a
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10
(10 rows)

step s3r: SELECT * FROM foo;
 a
--
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10
(10 rows)

step s2r1: SELECT * FROM foo;
 a
--
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10
(10 rows)

step s4r1: SELECT * FROM foo;
 a
--
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10
(10 rows)

step s1c: COMMIT;
step s2r2: SELECT * FROM foo;
 a
--
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10
(10 rows)

step s3c: COMMIT;
step s4r2: SELECT * FROM foo;
 a
--
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10
(10 rows)

step s4c: COMMIT;
step s2c: COMMIT;