wordChain

void wordChain(string file, string startWord) {
    map<string, string> first2Letters;
    vector<string> dictionary;
    string word;
    ifstream inputFile(file);
    if (inputFile) {
        while (inputFile >> word) {
            string firstTwo = word.substr(0, 2);
            first2Letters.insert(pair<string, string> {firstTwo, word});
            dictionary.push_back(word);
        }
    }
    inputFile.close();
    cout << startWord << endl;
    for (auto w : dictionary) {
        string lastTwo = startWord.substr(startWord.length() - 2);
        map<string, string>::iterator iter;
        iter = first2Letters.find(lastTwo);
        if (iter != first2Letters.end()) {
            string toRemove = startWord;
            dictionary.erase(remove(dictionary.begin(), dictionary.end(), toRemove), dictionary.end());
            startWord = first2Letters[lastTwo];
            cout << startWord << endl;
        }
    }
}