#include <iostream>
#include <vector>
using namespace std;

class SinglyLinkedListNode {
public:
    string data;
    SinglyLinkedListNode* next;

    SinglyLinkedListNode(string value) {
        data = value;
        next = nullptr;
    }
};

SinglyLinkedListNode* getShoppingCart(SinglyLinkedListNode* head, vector<vector<string>> queries) {
    for (auto& query : queries) {
        string action = query[0];
        string item_name = query[1];

        if (action == "PUSH_HEAD") {
            SinglyLinkedListNode* new_node = new SinglyLinkedListNode(item_name);
            new_node->next = head;
            head = new_node;
        } else if (action == "PUSH_TAIL") {
            SinglyLinkedListNode* new_node = new SinglyLinkedListNode(item_name);
            if (head == nullptr) {
                head = new_node;
            } else {
                SinglyLinkedListNode* current = head;
                while (current->next != nullptr) {
                    current = current->next;
                }
                current->next = new_node;
            }
        } else if (action == "POP_HEAD") {
            if (head != nullptr) {
                SinglyLinkedListNode* temp = head;
                head = head->next;
                delete temp;
            }
        }
    }

    return head;
}

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