text: const add = (subset, x) => {
      return subset ^ (1 << (x-1));
  }
  const remove = (subset, x) => {
      return subset ^ (1<<(x-1));
  }
  const display = subset => {
      const set = [];
      for (let bitNo=0; bitNo <=9; bitNo++) {
          if(subset & (1<<bitNo)) {
              set.push(bitNo+1);
          } 
      }
      return set;
   }
  const test = () => {
      console.log('Subset 19 represent ', display(19));
  }
  test();