Three versions of the Pier were constructed by man and modified by nature.

The data structure is fully persistent if every version can be both accessed and modified.

The most recent version was approved in 1979 and last modified in 1985:

This version of the M-17T was modified for use in the T-35 heavy tank.

These versions were modified slightly and then offered by Intertype.

(Note: this version has been modified to fit your screen.)

Someone also needs to validate that the final signed version was not modified in any way after execution copies were sent out.

Within the first week after the incident the version of events acknowledged by US spokesmen was significantly modified.

The version in the Ringmaster's hat has been specially modified by him for his own uses.

(Older versions was modified by individual owners to add additional capacity this way).