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Softology: secant 01
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Softology: secant 02
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Softology: secant 03
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Softology: secant 04
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Softology: secant 05
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Softology: secant 06
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Softology: secant 07
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Softology: secant 08
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Softology: secant 09
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Softology: secant 10
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Softology: secant 11
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Softology: secant 12
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Softology: secant 13
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Softology: secant 15
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Softology: secant 16
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Softology: secant 14
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Softology: secant 17