importPackage(java.io);
importPackage(java.lang);
// your code goes here
const showDuplicateSymbols= (e)=>{
const value = e.target.value.trim()
const uniqueChars = Array.from(new Set(value));
const twiceChars = uniqueChars.filter(
(char) => value.split(char).length - 1 === 2
);
return twiceChars.length > 0 ? value : " ";
}
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