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  // цикл
  function printList(list) {
    for (var a = list; a; a = a.next) {
      console.log(a.value)
    }
  }


  // рекурсия
  function printList(list) {
    if (list) {
      console.log(list.value);
      printList(list.next);
    }
  }

  printList(list);


  function printReverseList(list) {
    var arr = [];
    for (var a = list; a; a = a.next) {
      arr.unshift(a.value);
    }
    for (let i = 0; i < arr.length; i++) {
      console.log(arr[i])
      
    }
    
  }


  function printReverseList(list) {
      if (list) {
        printReverseList(list.next);
        console.log(list.value);
      }
  }

  printReverseList(list)