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union    20 1512
union    20 1491
nonunion 20 1575
nonunion 20 1512
nonunion 20 1488
union    30 1583
union    30 1529
union    30 1610
nonunion 30 1635
nonunion 30 1589
nonunion 30 1661
union    40 1601
union    40 1574
union    40 1636
nonunion 40 1645
nonunion 40 1616
nonunion 40 1689