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A1
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NTG given 1st minute after aspirin
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A2
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NTG given between 1st and 2nd minute after aspirin
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A3
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NTG given between 2st and 3rd minute after aspirin
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A4
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NTG given between 3rd and 4th minute after aspirin
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A5
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NTG given between 4th and 5th minute after aspirin
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A6
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NTG given between 5th and 7th minute after aspirin
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A7
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NTG given between 7th and 9th minute after aspirin
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A8
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NTG given between 9th and 12th minute after aspirin
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A9
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All NTG given 12th minute after aspirin
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N1
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2nd NTG given within 2t minutes after the first (or aspirin was given)
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N2
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2nd NTG (or aspirin) given between 2 and 4 min after the first NTG
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N3
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2nd NTG (or aspirin) given between 4 and 6 min after the first NTG
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N4
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2nd NTG (or aspirin) given between 6 and 8 min after the first NTG
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N5
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All cases where 2nd NTG (or aspirin) was given after 8 min after the first NTG
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