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print prefix? "abcd" "ab"
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print prefix? "abcd" "cd"
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print suffix? "abcd" "ab"
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print suffix? "abcd" "cd"
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print contains? "abcd" "ab"
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print contains? "abcd" "xy"
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print in? "ab" "abcd"
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print in? "xy" "abcd"
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print index "abcd" "bc"
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print index "abcd" "xy"
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