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s1 = "abcd"
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s2 = "adab"
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s3 = "ab"
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String.starts_with?(s1, s3)
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# => true
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String.starts_with?(s2, s3)
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# => false
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String.ends_with?(s1, s3)
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# => false
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String.ends_with?(s2, s3)
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# => true
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String.contains?(s1, s3)
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# => true
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String.contains?(s2, s3)
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# => true
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