This risk can be partially but not completely reduced by having a hierarchy of multiple certificate authorities.

Each round is completed when a particular city is completely reduced to rubble.

The hotel was reduced to its original size and completely refurbished and renovated.

Here the structure group has been reduced completely to the trivial group.

Four houses were completely reduced to rubble and several others suffered severe damage.

This could be reduced or dropped completely.

By that time, the homes were completely reduced to ashes.

The compound 1-naphthol is completely reduced to a mixture of decalin-ol isomers.

(n52) Georgia now became the only American state ever completely reduced to colony status.

A few days later the Germans withdrew, their salient having been completely reduced.