What does a taskset -p pid result of "e" mean?

I found the pid of my process. I ran taskset on the pid:

$ taskset -p 2059
pid 2059's current affinity mask: e

What does this affinity mask value "e" mean? I do not see anything about the possible output values in the [taskset docs](https://linux.die.net/man/1/taskset) . The man pages are the same as the docs.