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A177474
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Avoiding the pattern 121'3. To avoid 121'3 means not to have four consecutive letters such that the first letter and the third one is less than the second and the fourth letter and the second one is less than and the fourth one.
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3
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OFFSET
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1,2
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LINKS
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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Signy Olafsdottir (signy06(AT)ru.is), May 09 2010
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STATUS
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approved
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