Help using Base SAS procedures

Proc Mixed / DDFM=contain (how it works?)

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Proc Mixed / DDFM=contain (how it works?)

For a linear combination of fixed effects,

how DDFM=contain computes Denominator degree of freedom?

For the tests of a single effect, SAS manual explains how to get the degree of freedom by containment method.
However the manual does not explain, how containment method computes denominator degree of freedom.

I have kept searching internet and book, only to fail.

Any help or comments are appreciated.

Thank you.
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