// your code goes here
 
function findLinesWithTwoSymbol(input) {
  // Split the input into lines you can write another symbol for split
  const lines = input.split('\n');
 
  // Iterate through each line
  lines.forEach(line => {
    const charCount = [];
 
    // Iterate through each character in the line
    for (let char of line) {
      // Get the character code as the index (unique for each character)
      const index = char.charCodeAt(0);
 
      // Increment the count at the corresponding index
      charCount[index] = (charCount[index] || 0) + 1;
    }
 
    // Check if any character appears exactly twice
    if (charCount.some(count => count === 2)) {
      console.log(line);
    }
  });
}
 
// Example usage:
const input = `asdf 
fdas 
asds 
d 
fm 
dfaa 
aaaa 
aabb 
aaabb`;
 
findLinesWithTwoSymbol(input);

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