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ret: 0         st:-1 flags:0  ts:-1.000000
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ret:-1         st: 0 flags:1  ts:-0.320000
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ret:-1         st: 0 flags:1  ts:-0.760000
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ret: 0         st: 0 flags:1  ts: 2.840000
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ret: 0         st: 0 flags:1  ts: 2.400000
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ret:-1         st:-1 flags:1  ts:-0.645825