Amigo invisible con GoogleSheet

function shuffleArray(array) {
    for (var i = array.length - 1; i > 0; i--) {
        var j = Math.floor(Math.random() * (i + 1));
        var temp = array[i];
        array[i] = array[j];
        array[j] = temp;
    }
}

function equalList(a, b){
  for(var i=0; i<a.length; i++){
    if( a[i]===b[i])
      return true;
  }
  return false;
}

const subject = "Tu amigo invisible"

function repartir() {
  const sheet = SpreadsheetApp.getActiveSheet()
  const range = sheet.getRange(2,1,20,3).getValues()
  const friends = [];
  let availables = []
  for( var r = 0; r < range.length; r++){
    if( !range[r][0] )
      continue;
    friends.push( range[r][0])
    availables.push( range[r][0])
  }
  for( var retry=0; retry<10; retry++){
    shuffleArray(availables)
    Logger.log(availables)
    if( equalList(friends, availables) == false)
      break
  }
  for( var r=0; r<availables.length; r++){
    range[r][2] = availables[r];
    const message = `Hola ${range[r][0]} \n En el sorteo del amigo invisible te ha tocado: ${range[r][2]}`
    MailApp.sendEmail(range[r][1], subject, message);
  }

}