abstract:In English folklore an Asrai is a type of aquatic fairy, similar in some ways to mermaids, nixies, selkies, sirens or morgens. Some sources describe them as timid and shy, standing only between two and four feet tall, while others depict them as tall and lithe.
Then, after the introductionandanalysisofalgorithmASRAI we show a counterexample of this algorithm and present a revised algorithm CHEN1 to eliminate the disadvantage of algorithm ASRAI.