Comment by LonelyWolfe

Lemme know if there's another way to press every combination:

let maxElementReachedForElement = {}; let totalElements = 0; let firstElement = 0; let secondElement = 0;

setInterval(function() {

  document.getElementsByClassName('mobile-item')[firstElement].getElementsByClassName('item')[0].click();

  document.getElementsByClassName('mobile-item')[secondElement].getElementsByClassName('item')[0].click();

  totalElements = document.getElementsByClassName('mobile-item').length;

  secondElement = (secondElement + 1) % totalElements;

  if (secondElement == 0) {
   maxElementReachedForElement[firstElement] = totalElements; 
   if (Object.keys(maxElementReachedForElement).some(item => maxElementReachedForElement[item] < totalElements)) {
    let prevStart = Object.keys(maxElementReachedForElement).find(item => maxElementReachedForElement[item] < totalElements);
    firstElement = prevStart;
    secondElement = maxElementReachedForElement[prevStart]; // Start from previous end
   } else {
    firstElement = (firstElement + 1) % totalElements;
    secondElement = firstElement; // No need to repeat the previous combinations.
   }
  }

  document.title = firstElement + '+' + secondElement + '|' + totalElements;

}, 500); // TODO : Find a way other than delay