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function solution(s){
  var answer = 0;

  function remove(str) {
    for(let i = 0; i < str.length; i++) {
      if(str[i] === str[i+1]) {
        str.splice(i,2);
        remove(str);
      }
      if( i === str.length - 1 ) {
        return 0;
      }
    }
    return 1;
  }

  answer = remove(s.split(""));
  return answer;
}