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ex127so: NBER0016
©
ex127so: NBER0001
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ex127so: NBER0006
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ex127so: NBER0015
©
ex127so: NBER0023
©
ex127so: NBER0035
©
ex127so: NBER0029
©
ex127so: NBER1020
©
ex127so: NBER0026
©
ex127so: NBER0032
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ex127so: NBER33
©
ex127so: NBER0036
©
ex127so: NBER0043
©
ex127so: NBER0047
©
ex127so: NBER0034
©
ex127so: CON1313