mary is a photographer. she decided to take pictures of all the trails in the well-known mountains on saturday. the unique part of the mountain is that there are several garden hotels. each garden hotel connects with some other garden hotels with trails. mary estimates she can walk through each trail to take pictures exactly once in one day. to make sure she has enough energy for hiking and enjoys services from different garden hotels, she wants to book two hotels. mary will live in the first hotel on friday night so that she can get up early and start hiking. she wants to visit all trails exactly once, and then at night, she wants to stay in another hotel. is it possible for her to find two different hotels so that she can travel to each trail exactly once? return a boolean.