Selectors' Specificity

I'm reading CSS2 for the first time. I have not read other letters to this
place, so I don't know whether someone else has discussed this.

In section 6.4.1 (Cascading order), step three is as follows:

The secondary sort is by specificity of selector: more specific selectors
will override more general ones. Pseudo-elements and pseudo-classes are
counted as normal elements and classes, respectively.

while in section 6.4.3 (Calculating a selector's specificity), user agents
are to

* count the number of ID attributes in the selector (= a)
* count the number of other attributes and pseudo-classes in the selector (=
b)
* count the number of element names in the selector (= c)
* ignore pseudo-elements.

What is "ignore pseudo-elements" supposed to mean? If I were to use a
pseudo-element as a selector, would its specificity be a=0 b=0 c=1, or would
it be c=0?

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