There are 6 streets to be named after 6 tree types. Ash, Birch, Cedar, Fir, Maple, and Pine.
A city planner randomly selects the street names from the list of 6 tree types.
Compute the probability of each of the following events.

Event A: The first street is Cedar, followed by Ash then Fir, and then Birch.

Event B: The first four streets are Pine, Cedar, Fir, and Birch, without regard to order.

Write your answers as fractions in simplest form.