RemoveDuplicate

let a = ['a', 'a', 'b', 'a']
let count = 0
for(var i = 0; i <= a.length; i++){
  console.log(`i> ${a[i]}`)
  for(var j = 0; j <= a.length; j++) {
    console.log(`J> ${a[j]}`)
// from array a if char is  >= 3 remove from array a
    if(a[i] == a[j]){
      count = count + 1
    }

  }
}
console.log(count)