Parsed test spec with 2 sessions

starting permutation: rxwy1 c1 rywx2 c2
step rxwy1: DELETE FROM taby WHERE id = (SELECT min(id) FROM tabx);
step c1: COMMIT;
step rywx2: DELETE FROM tabx WHERE id = (SELECT min(id) FROM taby);
step c2: COMMIT;

starting permutation: rxwy1 rywx2 c1 c2
step rxwy1: DELETE FROM taby WHERE id = (SELECT min(id) FROM tabx);
step rywx2: DELETE FROM tabx WHERE id = (SELECT min(id) FROM taby);
step c1: COMMIT;
step c2: COMMIT;
ERROR:  could not serialize access due to read/write dependencies among transactions

starting permutation: rxwy1 rywx2 c2 c1
step rxwy1: DELETE FROM taby WHERE id = (SELECT min(id) FROM tabx);
step rywx2: DELETE FROM tabx WHERE id = (SELECT min(id) FROM taby);
step c2: COMMIT;
step c1: COMMIT;
ERROR:  could not serialize access due to read/write dependencies among transactions

starting permutation: rywx2 rxwy1 c1 c2
step rywx2: DELETE FROM tabx WHERE id = (SELECT min(id) FROM taby);
step rxwy1: DELETE FROM taby WHERE id = (SELECT min(id) FROM tabx);
step c1: COMMIT;
step c2: COMMIT;
ERROR:  could not serialize access due to read/write dependencies among transactions

starting permutation: rywx2 rxwy1 c2 c1
step rywx2: DELETE FROM tabx WHERE id = (SELECT min(id) FROM taby);
step rxwy1: DELETE FROM taby WHERE id = (SELECT min(id) FROM tabx);
step c2: COMMIT;
step c1: COMMIT;
ERROR:  could not serialize access due to read/write dependencies among transactions

starting permutation: rywx2 c2 rxwy1 c1
step rywx2: DELETE FROM tabx WHERE id = (SELECT min(id) FROM taby);
step c2: COMMIT;
step rxwy1: DELETE FROM taby WHERE id = (SELECT min(id) FROM tabx);
step c1: COMMIT;