Backpacker is planning to hike in a national forest. She will hike three or more of the following seven trails: Laurel, Maple, Oak, Poplar, Spruce, Tupelo, and Willow. She will not hike on any other trails. The choice of trails for her hike is constrained by the following conditions:

If she hikes Laurel, she must also hike Oak and Poplar.

If she hikes Tupelo, she must also hike Spruce and Willow.

If she hikes Willow, she can hike neither Maple nor Oak.

End of reading passage.