text: // Complete the stringConstruction function below.
  function stringConstruction(s) {
  	let arr = [];
  	let counter = 0;
  	for (let i = 0; i < s.length; i++) {
  		if (!arr.includes(s[i])) {
  			arr.push(s[i]);
  			counter++;
  		}
  	}
  	console.log(counter);
  }
  
  stringConstruction('abcabc');
  stringConstruction('abcd');
  stringConstruction('abab');